Atomic and Molecular collision Research Papers

Ionization Cross Section in Li 2+ + H Collision

2025

We present total ionization cross section (TICS) and single differential ionization cross sections (SDCS) of neutral hydrogen atoms by partially stripped lithium ions. We employed a 4-body classical trajectory Monte Carlo (CTMC) model and... more

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Cross-Sections for Projectile Ionization, Electron Capture, and System Breakdown of C 5+ and Li 2+ Ions with Atomic Hydrogen

by Saed J . Al Atawneh

2024, Atoms

For many disciplines of science, all conceivable collisional cross-sections and reactions must be precisely known. Although recent decades have seen a trial of large-scale research to obtain such data, many essential atomic and molecular... more

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Attractive atom-dimer interaction in a mass-imbalanced Fermi-Fermi mixture

by Rudolf Grimm

2024, Bulletin of the American Physical Society

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Collisional Stability ofK40Immersed in a Strongly Interacting Fermi Gas ofLi6

by Rudolf Grimm

2024, Physical Review Letters

We investigate the collisional stability of a sample of 40 K atoms immersed in a tunable spin mixture of 6 Li atoms. In this three-component Fermi-Fermi mixture, we find very low loss rates in a wide range of interactions as long as... more

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Understanding Work, Heat, and the First Law of Thermodynamics 2: Examples

by Hugo Hernandez

2024, ForsChem Research Reports

The First Law of Thermodynamics represents the principle of energy conservation applied to the interaction between different macroscopic systems. The traditional mathematical description of the First Law (e.g. dU=TdS-PdV) is rather... more

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Source oxidation problem in oxide-MBE environment and its solution

by Namrata Bansal

2024

Maintaining stable fluxes for multiple source elements is a challenging task when the source materials have significantly different oxygen affinities in a complex-oxide MBE environment. Although this problem has been known to the complex... more

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Understanding Work, Heat, and the First Law of Thermodynamics 1: Fundamentals

by Hugo Hernandez

2024, ForsChem Research Reports

The First Law of Thermodynamics is the Principle of Conservation of Energy applied to the interaction between Systems. Such interaction is partially observed at a macroscopic scale, in the form of Work. The remaining interaction, taking... more

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Una ecuación diferencial para el cálculo de las funciones de Jost para potencialesregulares. Aplicación al sistema e-+ H(1s)

by Luis Alcalá Varilla

2024, Ingenieria Y Ciencia

Una ecuación diferencial para el cálculo de las funciones de Jost para potenciales regulares Aplicación al sistema e − + H(1s) Uma equação diferencial para o cálculo das funções de jost para potenciais regular Aplicação ao sistema e − +... more

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Simulation of positron and electron elastic mean free path and diffusion angle on DNA nucleobases from 10 eV to 100 keV

by Nabila Yasmina Aouina

2024, Surface and Interface Analysis

Positron and electron interaction collisions in living cells are efficiently simulated by Monte Carlo (MC) codes where huge data tables are needed. Present study provides detailed results of charged particles elastic interactions needed... more

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Methods for analyzing resonances in atomic scattering

by Abcd Efgh

2023, The European Physical Journal Plus

Resonances, which are also described as autoionizing or quasi-bound states, play an important role in the scattering of atoms and ions with electrons. The current article is an overview of the main methods, including a recently-proposed... more

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Calculation of total and ionization cross sections for electron scattering by primary benzene compounds

by Rahla Naghma

2023, The Journal of chemical physics

The total and ionization cross sections for electron scattering by benzene, halobenzenes, toluene, aniline, and phenol are reported over a wide energy domain. The multi-scattering centre spherical complex optical potential method has been... more

Aniline Toluene FIG. 1. Structures of the molecules studied. for benzene and toluene. To compare present Qo, obtained for other molecules, we have also calculated Qjo, using binary encounter Bethe (BEB) model”! through Quantemol- N package.”” For benzene comparisons are available from the work of Schram ef al.”* and for toluene results are from Vacher.!° The Qion for halobenzenes and phenol are reported for the first time. Limited studies have been reported on total cross section (Qjo,) for electron collisions with the simplest and most important aromatic hydrocarbon (benzene). In 1931, Holst and Holtsmark2* were the first to perform experiments on electron—benzene collisions. They measured the total cross section in the energy range 0.5—25 eV. There are no theoretical calculations of total scattering cross sections for this molecule. However, Bettega et al. have reported calculated elastic cross section for benzene up to 30 eV. Similarly, in case of fluorobenzene and chlorobenzene, present results are the first theoretical calculations performed till date. The only experimental results available for the above two molecules are from the group of Makochekanwa et al.?*° Kato and co-workers””* have reported the total cross sections for toluene, whereas da Costa et al.”? have reported for phenol. Both groups have reported the theoretical data to support for their experiments for respective molecules. The cross section data for aniline, bromobenzene, and iodobenzene are reported for the first time. The lack of sufficient data on the above molecules has encouraged us to perform the present calculations. In Figure 1, the molecular structure of the targets studied in the present work is presented. Ne EEE The interaction between the scattering centre and incident electron is represented by a complex potential having the following form:

The parameter A is assumed to be fixed in the original model and determines a threshold below which V,,,(r) = 0 and the ionization or excitation is prevented energetically. The dynamic functions A;, Az, and A3 given above depend differently on p(r) and E;. The explicit form of A,, Az and A3 are given by The final potential formulated as above is used to solve the Schrddinger equation employing appropriate boundary conditions. The solution obtained in the form of complex phase shifts carries the signature of any interaction and is used to find the inelasticity factor given by

FIG. 2. Qior for e-benzene scattering in A2. Solid line: Present; stars: Holst and Holtsmark;?* squares: Mozejko et al. (Gdansk);*° triangles: Mozejko et al. (Trento);*° spheres: Sueoka.*! Figure 2 shows the Q,o; for benzene calculated through MSCOP method with previous comparisons from ionization threshold to 5000 eV. The theoretical curve of Holst and Holtsmark™* is higher than the present cross section curve in the low energies. Also, there is a large discrepancy in the present results and the measurements of Mozejko et al.

FIG. 4. Qior for e-chlorobenzene scattering in A2. Solid line: Present: spheres: Makochekanwa et al.? Figure 3 contains the Q,, for fluorobenzene from ionization threshold of the target to 5000 eV with the only available data of Makochekanwa et al.*° From ionization energy to 25 eV, the present total cross section has lower values than Makochekanwa et al.2° However after 25 eV, the present Q,,; falls within the experimental uncertainty of Makochekanwa et al.”° for most part of the curve, and thus shows a very good agreement with their measured data. Thus, the present Q,,, follows the same trend as the experimental curve of Makochekanwa et al. 1,26

FIG. 3. Qior for e-fluorobenzene scattering in A2. Solid line: Present; spheres: Makochekanwa et al.2°

FIG. 5. Qior for e-bromobenzene and e-iodobenzene scattering in A2. Solid line: iodobenzene; dashed line: bromobenzene.

FIG. 6. Qior for e-toluene scattering in A2. Solid line: Present; dashed line: Kato et al.’s”* theory; spheres: Kato et al.’s”’ experiment. Figure 6 gives the Q; for toluene along with the available theoretical and experimental data of Kato et al.?°’ The theoretical data reported by Kato et al.*® constantly underestimates the present results as well their own

FIG. 7. Qyor for e-aniline scattering in A2.

FIG. 8. Qiyor for e-phenol scattering in A2. Solid line: Present; dashed line: Costa et al.;2° spheres: Costa et al. The Qo, of phenol is shown in Figure 8 with previous available comparisons from Costa et al.”? In the lower energy range, the present result is seen to underestimate the theoretical study of Costa et al.,’? however merging at higher energies. Below 20 eV, the present cross section values are a little lower than the measured and calculated data points of Costa

FIG. 9. Qion for e-benzene scattering in A2. Solid line: Present CSP-ic;!2:!3:!5-20 dashed line: Present BEB;22 spheres: Schram et al.?3

FIG. 10. Qion for e-fluorobenzene scattering in A2. Solid line: Present CSP-ic;!2:!3:!5-20 dashed line: Present BEB.2” Figure 10 presents the Qj,, of fluorobenzene computed from both the CSP-ic!*:!>:!>-?° and BEB methods.”* There are no other previous cross section data available for comparison. Both the ionization curves are in extremely good agreement

FIG. 12. Qion for e-bromobenzene and e-iodobenzene scattering in A2. Solid line: Present Qjo, for bromobenzene; dashed line: Present Qjo, for iodoben- zene.

FIG. 11. Qion for e-chlorobenzene scattering in A2. Solid Black line: Solid line: Present CSP-ic;!2:!3:!5-29 dashed line: Present BEB.22

FIG. 14. Qion for e-aniline scattering in A2. Solid line: Present CSP-ic;!2:!3:!5-20 dashed line: Present BEB.2” The Qion Of phenol is shown in Figure 15 from its ionization potential to 5 keV. We have also calculated Qjo,

FIG. 13. Qion for e-toluene scattering in A2. Solid line: Present CSP-ic;!2:!3:!5-20 dashed line: Present BEB;22 spheres: Vacher et al. 10

FIG. 15. Qion for e-phenol scattering in A2. Solid line: Present CSP-ic;!2:!315-20 qashed line: Present BEB.22

TABLE I. Target properties. Here, U is a dimensionless variable given by U = E;/I. Such a functional form is implemented because of the energy dependence of ionization and excitation contributions at ow and high energy regions. In Equation (17), the first expression in the bracket ensures good energy dependence at ow energy as inverse of E;, while the second expression signifies the fall of discrete excitation cross sections at high energies dominated by dipole transitions, as In(U)/U. t is because of the fact that ionization contribution starts rising decreasing the fraction of electronic excitation as the incident energy increases. Moreover, as the energy becomes high enough, the contribution from the excitation advances towards zero, while the ionization contribution reaches unity. However, the consistency of this relation depends on the precise evaluation of the parameters Ci, Cy and a. These are dimensionless parameters which depend on the target properties, especially on the ionization potential of the target. Hence, three conditions are imposed for R. They are

TABLE II. Parameters used to evaluate R(U) through Eq. (17).

TABLE III. Qjo; values for present targets in A2. method has been adopted for its estimation. After pondering over various previously studied targets,!*!+3”° it was found that the relative contribution of Qjon is about 70%-80% of Qinei at the peak of inelastic cross section. The lower edge is considered for open shell species with low J and the upper edge for atoms and molecules with high J and having closed shell electronic contribution as in case of noble gases. The choice of a constant ratio at E,, will allow us to calculate cross section for unknown species, whilst maintaining the reproducibility of the formalism. After calculating these parameters using the boundary conditions mentioned in Equation (18), the ratio is formulated to evaluate Qjon. This is called the complex scattering potential-ionization contribution (CSP-ic) method.!*:!3:'5-2° The employed approach is not accurate;

et al.”° The deviation of present cross section in the low energy region may be due the following reasons: (1) inefficiency of present method to model polarization potential effectively at low energies, and (2) omission of dipole effects in the present calculation. From 20 eV to 5000 eV the present results are in complete agreement with the experimental measurements of Costa et al.*? and falls entirely within the experiment uncertainty mentioned by them. Thus, we see that the present In this subsection the calculated total ionization cross section data is reported. The numerical values are tabulated in Table IV and graphs are presented through Figures 9-15.

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New H2O–H2O collisional rate coefficients for cometary applications

by Marie-Lise Dubernet

2023, Monthly Notices of the Royal Astronomical Society

We re-introduce a semiclassical methodology based on theories developed for the determination of broadening coefficients. We show that this simple and extremely fast methodology provides results that are in good agreement with results... more

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Confusion and Illusions in Collision Theory

by Hugo Hernandez

2023, ForsChem Research Reports

Material collisions (and interaction processes in general) play an important role in most, if not all, physicochemical phenomena observed in Nature including (but not limited to): Chemical reactions, diffusion, viscosity, adhesion,... more

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BASECOL2012: A collisional database repository and web service within the Virtual Atomic and Molecular Data Centre (VAMDC)

by Sarantos Marinakis

2023, Astronomy & Astrophysics

The BASECOL2012 database is a repository of collisional data and a web service within the Virtual Atomic and Molecular Data Centre (VAMDC, http://www.vamdc.eu). It contains rate coefficients for the collisional excitation of rotational,... more

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Stark broadening of the He I 492.2 nm line with forbidden components in dense low-temperature plasma

by Milivoje Ivkovic

2023, Journal of Quantitative Spectroscopy and Radiative Transfer

We present the results of an experimental study of the He I 492.2 nm line with forbidden components emitted by low-electron temperature and high electron number density helium plasma with or without addition of hydrogen. The shapes of the... more

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Dielectric constant of atomic fluids with variable polarizability

by Jean-Jacques Weis

2023, Proceedings of the National Academy of Sciences

The Clausius-Mossotti function for the dielectric constant is expanded in terms of single atom and pair polarizabilities, leading to contributions that depend on both the trace and the anisotropy of the pair-polarizability tensor. The... more

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Trajectory Dynamics of Gas Molecules and Galaxy Formation

by Gerald Hintz

2023

The probability distribution of the velocity of gas molecules in a closed container is described by the kinetic theory of gases. When molecules collide or impact the walls of a container, they exchange energy and momentum in accordance... more

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Methods for analyzing resonances in atomic scattering

by abcd efgh

2023, The European Physical Journal Plus

Resonances, which are also described as autoionizing or quasi-bound states, play an important role in the scattering of atoms and ions with electrons. The current article is an overview of the main methods, including a recently-proposed... more

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Methods for analyzing resonances in atomic scattering

by abcd efgh

2023, The European Physical Journal Plus

Resonances, which are also described as autoionizing or quasi-bound states, play an important role in the scattering of atoms and ions with electrons. The current article is an overview of the main methods, including a recently-proposed... more

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Question Everything: Models vs. Reality

by Hugo Hernandez

2023, ForsChem Research Reports

This is a continuation of the fictional dialogue taking place by Descartes' hypothetical characters (Eudoxius, Epistemon and Polyander). In this opportunity, the discussion revolves around the common confusion between models and reality.... more

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Methods for analyzing resonances in atomic scattering

by abcd efgh

2023, The European Physical Journal Plus

Resonances, which are also described as autoionizing or quasi-bound states, play an important role in the scattering of atoms and ions with electrons. The current article is an overview of the main methods, including a recently-proposed... more

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Entropy and Enthalpy: Reality or Grandiose Mistake

by Hugo Hernandez

2023, ForsChem Research Reports

Thermodynamics embraces both the concepts of entropy and enthalpy. Strangely, both concepts express work done by an expanding system in terms of W=PdV, without providing the necessary clarity concerning what PdV actually represents. In... more

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PID Controller Stability and Tuning using a Time-Domain Approach

by Hugo Hernandez

2023, ForsChem Research Reports

Automatic control is an important tool in process systems engineering for achieving high productivity and quality with reduced variability and improved safety during operation. Nowadays, the most common type of automatic controller used... more

Different PID controllers are tuned following common methods found in the literature [5,6] (summarized in Table 2) as well as the equations proposed in this work for the time-domain stability and tuning (Table 1).

As a second example, let us consider the neutralization of an acid aqueous effluent generated as a by-product in a chemical process, as depicted in Figure 4. The acid waste enters the stirred tank at the bottom, and exits the process at the top by overflow. The acid concentration is determined at the outlet by an online analyzer with a long time delay. The total dead time of the process is 0g = 45 s. The signal received from this analyzer is used to manipulate the flow of sodium hydroxide solution (the manipulated variable is the opening percentage of the valve). The process can be described by the following system of differential equations: tank at the bottom, and exits the process at the top by overflow. The acid concentration is

Figure 5. Dynamic response of the wastewater neutralization process to a step change in valve opening.

Figure 8. Continuous exothermic reactor with temperature control. ‘igure 8. The reactor level is kept constant by an overflow stream. The following example corresponds to a runaway system, consisting on a continuous stirred tank reactor carrying out a highly exothermic isomerization reaction. The reaction temperature is controlled by the flow of fresh reactant added to the reactor. However, this stream not only cools the mixture but also increases the concentration of the reactant, favoring the exothermic reaction. This hypothetical and not recommended, unstable configuration is illustrated in Figure 8. The reactor level is kept constant by an overflow stream. Linear runaway models are seldom found in practice due to two main reasons: First, no proces will reach a state value x(t > 00) — +00 as a result of an open-loop disturbance; and seconc because real processes are usually nonlinear and therefore, the linear runaway behavior is onl observed for a limited range of operating conditions. The continuous exothermic reactio considered in this example is not an exemption. At low temperatures, the reactor is sel regulated because the rate of reaction is negligible. At intermediate temperatures, as the rat of reaction increases, the runaway behavior is observed. At higher temperatures, sel regulation emerges due to larger heat losses to the environment, and most importantly because the reactant is depleted, extinguishing the reaction. A hypothetical example of suc! behavior is illustrated in Figure 9. Initially the system is in a runaway condition until the reactar is depleted, reaching extremely high temperatures that the reactor itself would not be able t sustain. Then, the system becomes self-regulating until it accumulates enough reactan reaching a runaway condition again.

where T is the temperature measured in the reactor in K, u is the percentage of opening of the linear valve in the stream of fresh reactant, T, is the atmospheric temperature (a potentia disturbance), and t is time in minutes. The dead time is considered negligible. As it can be seer in Eq. (5.5), the equilibrium condition is T = 410.6 K for u = 50 and T, = 298K. However, an’ disturbance in the process will destabilize the system. Figure 10 shows the dynamic response o the system when a step change in the manipulated variable (from u = 50 to u = 100) is done at time 0, when the system is already at equilibrium. As a result, the reaction temperature decreases due to the larger amount of cold reactant entering the process and the decrease ir residence time in the reactor.

Figure 10. Dynamic response of the exothermic reactor to a step change in valve opening of fresh (cold) reactant. decreases due to the larger amount of cold reactant entering the process and the decrease in

Figure 12. Dynamic performance of the PID/PI controller for the exothermic reactor example, considering only the time-domain tuning method.

Figure 13. Buffer tank with level control, storing process water for the plant. As a final example, let us consider an integrating or capacitive system. In this case we have an intermediate buffer tank providing process water to different units in the plant. The level of the tank is regulated using a variable-speed pump replenishing the water consumed by the plant. This system is depicted in Figure 13.

Figure 15. Dynamic response of the level in a buffer tank to random disturbances in water

Figure 16. Dynamic performance of the PID/PI controller for the exothermic reactor example, considering only the time-domain tuning method. Table 6. Parameters and control performance for the buffer tank problem

Finally, and only for comparative purposes, Figure 17 shows the behavior of the PID parameters obtained by the Ciancone-Marlin correlations and by the proposed time-domain method. This plots show that the values of the parameters tuned with the proposed method are closer to Ciancone-Marlin’s values for PI controllers than for PID controllers. for small dead times, while the PI tuning rule was highly competitive for large dead times.

Table 1. Proposed Equations for determining the Tuning Settings for PID and PI Controllers Table 1 summarizes the tuning equations for the controller parameters (considering PID and PI control) obtained in this work, for the different possible types of linear systems: Self- regulating, runaway and capacitive. Notice that process gain Kp and characteristic process time Tp are only considered for self-regulating systems. For all other systems, the model terms A and BC are used. The identification of these parameters was considered in Section 1.

Table 2. Common Equations for determining the Tuning Settings for PID Controllers (self-

articularly for the Ciancone-Marlin method, only the PI configuration was used because the ID configuration resulted in zero derivative times. Due to the small dead time, most common uning methods (with the exception of Ciancone-Marlin) yield very large controller gain values ind very low integral times, resulting in bang-bang behavior for about 4 hours. Ciancone-Marlin provides two sets of tuning parameters (suggesting PI controllers) with a non-oscillating ipproach to the set point value, and without saturating the manipulated variable. Particularly, he disturbance response parameters presented a small overshoot, not observed with the set oint response parameters. The PID and PI controllers tuned using the time-domain approach the expressions proposed in this work), were also non-oscillating and reached the set point alue faster than Ciancone-Marlin, but the manipulated variable became saturated at the yeginning. This is not necessarily an operational issue, as long as sudden changes in the nanipulated variable are not observed (as in the case of bang-bang control). The best erformance in terms of sum of square error was provided by the time-domain PID, closely ollowed by the time-domain PI. In addition, the PI controller tuned with the time-domain ipproach presented a small overshoot (similar to Ciancone-Marlin’s disturbance response), not »bserved in the corresponding time-domain PID controller (similar to Ciancone-Marlin’s set point response). tuning methods (with the exception of Ciancone-Marlin) yield very large controller gain values

Table 1. Proposed Equations for determining the Tuning Settings for PID and PI Controllers where 6, represents the actual dead time of the process, and

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Emission and recombination coefficients for hydrogen with -distributed electron energies

by abcd efgh

2023, Monthly Notices of the Royal Astronomical Society

We provide a data set of emission and recombination coefficients of hydrogen using a κdistribution of electron energies rather than the more traditional Maxwell-Boltzmann (MB) distribution. The data are mainly relevant to thin and... more

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Methods for analyzing resonances in atomic scattering

by abcd efgh

2023, The European Physical Journal Plus

Resonances, which are also described as autoionizing or quasi-bound states, play an important role in the scattering of atoms and ions with electrons. The current article is an overview of the main methods, including a recently-proposed... more

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Calculations of total ionization cross sections for halogen compounds on electron impact from threshold to 2 keV

by Rucha Dave

2023, Indian Journal of Physics

Calculation for electron impact total ionization cross sections on halogen compounds (BF, SiF, BCl, SiCl) are performed employing Spherical Complex Optical Potential and Complex Optical Potential-ionization contribution (CSP-ic)... more

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Emission and recombination coefficients for hydrogen with -distributed electron energies

by Abcd efgh

2023, Monthly Notices of the Royal Astronomical Society

We provide a data set of emission and recombination coefficients of hydrogen using a κdistribution of electron energies rather than the more traditional Maxwell-Boltzmann (MB) distribution. The data are mainly relevant to thin and... more

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Methods for analyzing resonances in atomic scattering

by Abcd efgh

2023, The European Physical Journal Plus

Resonances, which are also described as autoionizing or quasi-bound states, play an important role in the scattering of atoms and ions with electrons. The current article is an overview of the main methods, including a recently-proposed... more

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Methods for analyzing resonances in atomic scattering

by ABCD EFGH

2023, The European Physical Journal Plus

Resonances, which are also described as autoionizing or quasi-bound states, play an important role in the scattering of atoms and ions with electrons. The current article is an overview of the main methods, including a recently-proposed... more

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Emission and recombination coefficients for hydrogen with -distributed electron energies

by Abcd Efgh

2023, Monthly Notices of the Royal Astronomical Society

We provide a data set of emission and recombination coefficients of hydrogen using a κdistribution of electron energies rather than the more traditional Maxwell-Boltzmann (MB) distribution. The data are mainly relevant to thin and... more

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Methods for analyzing resonances in atomic scattering

by Abcd Efgh

2023, The European Physical Journal Plus

Resonances, which are also described as autoionizing or quasi-bound states, play an important role in the scattering of atoms and ions with electrons. The current article is an overview of the main methods, including a recently-proposed... more

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Methods for analyzing resonances in atomic scattering

by abcd efgh

2023, The European Physical Journal Plus

Resonances, which are also described as autoionizing or quasi-bound states, play an important role in the scattering of atoms and ions with electrons. The current article is an overview of the main methods, including a recently-proposed... more

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Methods for analyzing resonances in atomic scattering

by abcd efgh

2023, The European Physical Journal Plus

Resonances, which are also described as autoionizing or quasi-bound states, play an important role in the scattering of atoms and ions with electrons. The current article is an overview of the main methods, including a recently-proposed... more

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Methods for analyzing resonances in atomic scattering

by Taha Sochi

2023, The European Physical Journal Plus

Resonances, which are also described as autoionizing or quasi-bound states, play an important role in the scattering of atoms and ions with electrons. The current article is an overview of the main methods, including a recently-proposed... more

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Methods for analyzing resonances in atomic scattering

by ABCD EFGH

2023, The European Physical Journal Plus

Resonances, which are also described as autoionizing or quasi-bound states, play an important role in the scattering of atoms and ions with electrons. The current article is an overview of the main methods, including a recently-proposed... more

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Methods for analyzing resonances in atomic scattering

by abcd efgh

2023, The European Physical Journal Plus

Resonances, which are also described as autoionizing or quasi-bound states, play an important role in the scattering of atoms and ions with electrons. The current article is an overview of the main methods, including a recently-proposed... more

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A differential equation for the calculation of the functions de jost for regular potentials Application to the system e− + H (1s)

by HECTOR ROGER MAYA TABOADA

2022, Ingenieria Y Ciencia

Una ecuación diferencial para el cálculo de las funciones de Jost para potenciales regulares Aplicación al sistema e − + H(1s) Uma equação diferencial para o cálculo das funções de jost para potenciais regular Aplicação ao sistema e − +... more

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Una ecuación diferencial para el cálculo de las funciones de Jost para potencialesregulares. Aplicación al sistema e-+ H(1s)

by HECTOR ROGER MAYA TABOADA

2022, Ingenieria Y Ciencia

Una ecuación diferencial para el cálculo de las funciones de Jost para potenciales regulares Aplicación al sistema e − + H(1s) Uma equação diferencial para o cálculo das funções de jost para potenciais regular Aplicação ao sistema e − +... more

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Universal Scaling Laws in the Dynamics of a Homogeneous Unitary Bose Gas

by Raphael Lopes

2022, Physical review letters

We study the dynamics of an initially degenerate homogeneous Bose gas after an interaction quench to the unitary regime at a magnetic Feshbach resonance. As the cloud decays and heats, it exhibits a crossover from degenerate- to... more

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Electron impact induced dissociation of N2H+into NH+

by Abdullah JABR

2022, EPJ Web of Conferences

Dissociative excitation of N 2 H + has been investigated in the energy range from 7.5 to 2500 eV using a crossed beams apparatus. Absolute cross sections are reported for the channel leading to NH + formation. Good agreement is found with... more

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Emission and recombination coefficients for hydrogen with -distributed electron energies

by Abcd Efgh

2022, Monthly Notices of the Royal Astronomical Society

We provide a data set of emission and recombination coefficients of hydrogen using a κdistribution of electron energies rather than the more traditional Maxwell-Boltzmann (MB) distribution. The data are mainly relevant to thin and... more

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Methods for analyzing resonances in atomic scattering

by Abcd Efgh

2022, The European Physical Journal Plus

Resonances, which are also described as autoionizing or quasi-bound states, play an important role in the scattering of atoms and ions with electrons. The current article is an overview of the main methods, including a recently-proposed... more

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Collisional excitation of singly deuterated ammonia NH2D by H2

by E. Roueff

2022, Monthly Notices of the Royal Astronomical Society

The availability of collisional rate coefficients with H 2 is a prerequisite for interpretation of observations of molecules whose energy levels are populated under non-local thermodynamical equilibrium conditions. In the current study,... more

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Electron impact induced dissociation of N2H+into NH+

by P. Defrance

2022, EPJ Web of Conferences

Dissociative excitation of N 2 H + has been investigated in the energy range from 7.5 to 2500 eV using a crossed beams apparatus. Absolute cross sections are reported for the channel leading to NH + formation. Good agreement is found with... more

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Methods for analyzing resonances in atomic scattering

by Abcd Efgh

2022, The European Physical Journal Plus

Resonances, which are also described as autoionizing or quasi-bound states, play an important role in the scattering of atoms and ions with electrons. The current article is an overview of the main methods, including a recently-proposed... more

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Methods for analyzing resonances in atomic scattering

by Abcd Efgh

2022, The European Physical Journal Plus

Resonances, which are also described as autoionizing or quasi-bound states, play an important role in the scattering of atoms and ions with electrons. The current article is an overview of the main methods, including a recently-proposed... more

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Computation of the electron impact total ionization cross sections of CnH(2n+1)OH molecules from the threshold to 2keV energy range

by Vinodkumar Chackara

2022, International Journal of Mass Spectrometry

Present paper reports calculations of total ionization cross sections (Q ion) for simple but important alcohols (CH 3 OH, C 2 H 5 OH, 1-C 3 H 7 OH) on electron impact with incident energies (E i) ranging from ionization threshold (I) of... more

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Atomic and Molecular Aspects of Astronomical Spectra

by Taha Sochi

2022, arXiv: Atomic Physics

In the first section we present the atomic part where a C2+ atomic target was prepared and used to generate theoretical data to investigate recombination lines arising from electron-ion collisions in thin plasma. R-matrix method was used... more

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Division B Commission 14 Working Group: Collision Processes

by Gillian Peach

2022, Proceedings of the International Astronomical Union

Since our last report (Peach & Dimitrijević 2012), a large number of new publications on the results of research in atomic and molecular collision processes and spectral line broadening have been published. Due to the limited space... more

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Effects of Tungsten Polycidation on the Hot-Carrier Degradation in Buried-Channel LDD p-MOSFET's

by Chung H Ling

2022, Japanese Journal of Applied Physics

The quantum theory is applied for the accurate computation of high-frequency (up to 400 cm −1) spectral intensities in Ar-Ar collision-induced light scattering (CILS) processes at room temperature. Numerically, this becomes possible by... more

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Atomic and Molecular collision

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