The rotational frequency for which the energy of pairing vibrations becomes zero provides a usefu... more The rotational frequency for which the energy of pairing vibrations becomes zero provides a useful definition of (o cr » The fluctuations associated with these modes induce ground state correlations which renormal^ze in an important way the energy and alignment of rotational bands over a broad range of frequencies around io cr. Based on the random phase approximation a simple prescription to take these effects into account is discussed.
The Xe IV spectrum between 2280 and 6100 A emitted by a new model of a non conventional spectrosc... more The Xe IV spectrum between 2280 and 6100 A emitted by a new model of a non conventional spectroscopic «ource, has been studied. S i* hundred and «ixty «even lines has been assigned to this ion by employing the conventional method of energy variation, and the characteristic form of the spectral lines resulting from this type of spectral lamp has been particularly considered. RESUMEN El espectro del Xe IV entre 2280 y 6100 A emitido por un nuevo modelo de fuente espectroscópica no-convencional, ha sido estudiado. Seiscientas sesenta y siete li'neas han sido asignadas a este ion, empleando el método convencional de variación de energía, y ha sido particularmente considerada la forma característica de las líneas espectrales que resultan de este tipo de fuente espectral.
A capillary pulsed-discharge and a theta-pinch were used to record Kr spectra in the region of 33... more A capillary pulsed-discharge and a theta-pinch were used to record Kr spectra in the region of 330–4800 Å. A set of 168 transitions of these spectra were classified for the first time. We extended the analysis to twenty-five new energy levels belonging to 3s23p24d, 3s23p25d even configurations. We calculated weighted transition probabilities (gA) for all of the experimentally observed lines and lifetimes for new energy levels using a relativistic Hartree–Fock method, including core-polarization effects.
Three-times ionized xenon Xe IV spectrum in the 1070–6400 Å region was analyzed using a pulsed di... more Three-times ionized xenon Xe IV spectrum in the 1070–6400 Å region was analyzed using a pulsed discharge light source. A set of 163 transitions was classified for the first time, and 36 new energy levels belonging to the 5s25p26d and 5s25p27s even configurations were determined. The relativistic Hartree–Fock method, including core-polarization effects, were used. In these calculations, the electrostatic parameters were optimized by a least-square procedure in order to improve the adjustment to experimental energy levels. We also present a calculation based on a relativistic multiconfigurational Dirac–Fock approach.
A pulsed discharge light source was used to study the two and three times ionized argon (Ar II, A... more A pulsed discharge light source was used to study the two and three times ionized argon (Ar II, Ar III) spectra in the 480–6218 Å region. A set of 129 transitions of Ar III and 112 transitions of Ar IV were classified for the first time. We extended the analysis of Ar III to five new energy levels belonging to 3s23p34d, 3s23p35s odd configurations. For Ar IV, 10 new energy levels of the 3s23p23d and 3s23p24p even and odd configurations, respectively, are presented. For the prediction of energy levels, line transitions, and transition probabilities, relativistic Hartree–Fock calculations were used.
A pulsed discharge light source to study the six and seven times ionized xenon spectra in the 419... more A pulsed discharge light source to study the six and seven times ionized xenon spectra in the 419–4642 Å region was used. A set of 40 transitions of Xe VII and 25 transitions of Xe VIII were classified for the first time. We revised the values for the previously known energy levels and extended the analysis for Xe VII to 10 new energy levels belonging to 5s6d, 5s7s and 5s7p, 4d95s25p even and odd configurations, respectively. Seven new energy levels of the core excited configuration 4d95s5d of Xe VIII are presented. For the prediction of the atomic parameters, energy levels, and transition, relativistic Hartree–Fock calculations were used.
A capillary discharge tube was used to record the Xe spectrum in the 400-5500 Å region. A set of ... more A capillary discharge tube was used to record the Xe spectrum in the 400-5500 Å region. A set of 243 lines of the Xe vi spectrum was observed, and 146 of them were classified for the first time. For all known lines, we calculated the weighted oscillator strengths (gf) and weighted transition probabilities (gA) using the configuration interaction in a relativistic Hartree-Fock approach. The energy matrix was calculated using energy parameters adjusted to fit the experimental energy levels. Core polarization effects were taken into account in our calculations. Experimental energy values and calculated lifetimes are also presented for a set of 88 levels. From these levels, 32 were classified for the first time and 33 had their values revised. Our analysis of the 5s5p5d and 5s5p6s configurations was extended in order to clarify discrepancies among previous works.
The thirteen times ionized tungsten is isoelectronic with PmI. Wavelengths and transition probabi... more The thirteen times ionized tungsten is isoelectronic with PmI. Wavelengths and transition probabilities for the 5s-5p and 5p-5d transitions of WXIV, identifying the ground state as 4f 13 5s 2 2 F 7/2 were calculated. Both, a relativistic Hartree Fock approach, including core-polarization effects, and a purely relativistic multiconfiguration Dirac-Fock method were used for the calculations. Particularly, 5s-5p transitions were compared with experimental results obtained with VUV electron beam ion trap (EBIT) spectroscopy.
The spectrum of Xe + has been observed in the S70-6900-A range. The previous analysis has been re... more The spectrum of Xe + has been observed in the S70-6900-A range. The previous analysis has been re- vised and extended. Al) levels of the ground configuration (Ss2Sp3} and of the SsSp configuration are now established,
The spectrum of triply ionized xenon {XeIv) has been observed in the region 570-6900 A. The confi... more The spectrum of triply ionized xenon {XeIv) has been observed in the region 570-6900 A. The configurations Ss 5p Sd and 5s 5p 6s have been studied and the energy levels reported for these configurations by Moore [(Atomic Energy Levels, Natl. Bur. Stand. Ref. Data Ser. , Natl. Bur. Stand. (U.S.) Circ. No. 467 (U.S. GPO, Washington, D.C. , 1971)] were revised and extended to include seven new levels. The configuration 5s5p was included in the analysis to take into account the strong interaction between this configuration and Ss'5p 5d. Configuration-interaction Rydberg series have been also included in the calculations. This investigation was supported by Hartree
The spectrum of doubly ionized xenon has been investigated. The study is based on photographic re... more The spectrum of doubly ionized xenon has been investigated. The study is based on photographic recordings of xenon spectra in the 490-8900 À range. The number o f classified lines has been increased from about 300 to about 1400. The lines have been classified as transitions between 73 even levels belonging to the 5s2 Sp4, S^Sp^ôp, 4/, 5 / and 5r°5/>6 configurations, and 83 odd levels belonging to the 5sSps, 5s15/r* 6s, 7s, 5d and 6d configurations. In particular, the classifications include most o f the Xe III laser lines. The experimentally observed level structures are compared with the results of Hartree-Fock calculations and least-squares fits. A comparison is also made between the results o f the present analysis and the published data on the Xe N 4 .OO Auger spectrum.
T he ground-state configuration o f five times ionized argon, (A r5+), is 3s23p with the term 2P.... more T he ground-state configuration o f five times ionized argon, (A r5+), is 3s23p with the term 2P. Ar V I belongs to the Al I isoelectronic sequence. Excited states either belong to simple one-electron configuration o f the type 3s2nl or to threeelectron configurations such as 3s3p2, 3p 3 and 3s3p(1,3P)n/ etc., giving both doublets and quartets. T he spectra o f the first, second and third elem ents in this sequence are presented in A tom ic Energy Levels (AEL), Ref. [1 ]. Subsequent to this tabulation, the Al I spectrum was investigated by Eriksson and Isberg [2 ]. Results about Si II were published by Shenstone [3 ] and the P III spectrum w as studied by M agnusson and Zetterberg [4 ]. Early results o n the spectra o f S IV and Cl V have been published in A E L but later results o f S IV were com piled by M artin et al., see Ref. [5 ] and references therein. T he first results about the spectrum o f Ar VI in the vacuum ultraviolet were published by Phillips and Parker [6 ]. Faw cett et al. [7 ] studied the spectra o f m ultiple ionized inert gases, including Ar, and Schönheit [8 ] m ade a similar study finding a large quantity o f new lines. Lines corresponding to the spinforbidden resonance multiplet 3s23p 2P-3 s3 p 2 4P were reported by Ekberg and Svensson [9 ]. U sing a Theta-Pinch light source Fawcet et al. [1 0 ] classified som e lines o f Ar VI.
The spectrum of Kr VI was recorded in the 23-254-nm-wavelength range, resulting in 109 new line c... more The spectrum of Kr VI was recorded in the 23-254-nm-wavelength range, resulting in 109 new line classifications. From these data we were able to identify 22 new energy levels belonging to the 4s4p4d and the 4s4p5s configurations. The levels belonging to the 4s 2 5p and the 4s 2 4f configurations and the levels 4s4p 2 2 S 1/2 and 4p 3 2 P 1/2 have new energy values proposed. The results are supported by isoelectronic extrapolation and multiconfiguration Hartree-Fock calculations with relativistic corrections. The experimental data were obtained from a capillary-discharge tube and theta-pinch light sources.
Journal of Physics B: Atomic, Molecular and Optical Physics, 2002
In s t it u t e o f P h y s ic s P u b l is h in g J o u r n a l o f Ph y s ic s B: At o m ic , M... more In s t it u t e o f P h y s ic s P u b l is h in g J o u r n a l o f Ph y s ic s B: At o m ic , M o l e c u l a r a n d Opt ic a l Ph y s ic s New energy levels of the 4s24p5s, 4s24p4d and 4s24p5p configurations of the Kr v spectrum Energy levels of Kr i to Kr xxxvi were reviewed and compiled by Sugar and Musgrove (1991) and tables of the classified lines of Kr v to Kr xxxvi were compiled by Shirai e t a l (1995). Four-times-ionized krypton, Kr v, belongs to the Ge i isoelectronic sequence and has the ground configuration 4s24p2. The spectra of the first, second, third and fourth elements of this sequence were presented in the book A to m ic E nergy L evels (Moore 1971). The As n spectrum was reinvestigated by Li and Andrew (1971) and the Br rv spectrum was revised by Joshi and Budhiraja (1971). The krypton isonuclear sequence has also been studied in different works by members of the Centro de Investigaciones Opticas Group, La Plata, Argentina and the Campinas Group, Sao Paulo, Brazil. Reyna Almandos et a l (1996,1998) published new energy levels for Kr hi and Kr iv. Pagan e t al (1995) reported the study of the 4s4p4d and 4s4p5s configurations of Kr vi and Raineri et al (2000) presented the spectroscopic analysis of the 4p4d configuration of Kr v i i. All these experiments were carried out using a discharge tube and a theta pinch discharge.
One of the major advantages of proton or ion beams, applied in cancer treatment, is their excelle... more One of the major advantages of proton or ion beams, applied in cancer treatment, is their excellent depthdose profile exhibiting a low dose in the entrance channel and a distinct dose maximum (Bragg peak) near the end of range in tissue. In the region of the Bragg peak, where the protons or ions are almost stopped, experimental studies with low-energy particle beams and thin biological samples may contribute valuable information on the biological effectiveness in the stopping region. Such experiments, however, require beam optimization and special dosimetry techniques for determining the absolute dose and dose homogeneity for very thin biological samples. At the National Centre of Accelerators in Seville, one of the beam lines at the 3 MV Tandem Accelerator was equipped with a scattering device, a special parallelplate ionization chamber with very thin electrode foils and target holders for cell cultures. In this work, we present the calibration in absolute dose of EBT3 films [Gafchromic radiotherapy films, http://www.ashland .com/products/gafchromic-radiotherapy-films] for proton energies in the region of the Bragg peak, where the linear energy transfer increases and becomes more significant for radiobiology studies, as well as the response of the EBT3 films for different proton energy values. To irradiate the films in the Bragg peak region, the energy of the beam was degraded passively, by interposing Mylar foils of variable thickness to place the Bragg peak inside the active layer of the film. The results obtained for the beam degraded in Mylar foils are compared with the dose calculated by means of the measurement of the beam fluence with an ionization chamber and the energy loss predicted by SRIM2008 code.
Se presenta en esta comunicación una nueva técnica holográfica por doble exposición, para el estu... more Se presenta en esta comunicación una nueva técnica holográfica por doble exposición, para el estudio de deformaciones colocando un interferograma entre el objeto a analizar y un me dio de registro fotográfico. Este novedoso método permite la obtención simultánea de los datos cuantitativos y de la estruc tura topográfica de la deformación. Se destaca su simplicidad,
A liquid air refrigerated crossed field stimulated emitter was constructed to observe the 0-0 UV ... more A liquid air refrigerated crossed field stimulated emitter was constructed to observe the 0-0 UV (337,1 nm) laser band of molecular nitrogen. The spectral analysis clearly showed that only one of the Λ-doublets were observed. The Λ-doublet components belong to two different Fortrat parabolas. This result allows a critical discussion of previous publications on the same subject.
The rotational frequency for which the energy of pairing vibrations becomes zero provides a usefu... more The rotational frequency for which the energy of pairing vibrations becomes zero provides a useful definition of (o cr » The fluctuations associated with these modes induce ground state correlations which renormal^ze in an important way the energy and alignment of rotational bands over a broad range of frequencies around io cr. Based on the random phase approximation a simple prescription to take these effects into account is discussed.
The Xe IV spectrum between 2280 and 6100 A emitted by a new model of a non conventional spectrosc... more The Xe IV spectrum between 2280 and 6100 A emitted by a new model of a non conventional spectroscopic «ource, has been studied. S i* hundred and «ixty «even lines has been assigned to this ion by employing the conventional method of energy variation, and the characteristic form of the spectral lines resulting from this type of spectral lamp has been particularly considered. RESUMEN El espectro del Xe IV entre 2280 y 6100 A emitido por un nuevo modelo de fuente espectroscópica no-convencional, ha sido estudiado. Seiscientas sesenta y siete li'neas han sido asignadas a este ion, empleando el método convencional de variación de energía, y ha sido particularmente considerada la forma característica de las líneas espectrales que resultan de este tipo de fuente espectral.
A capillary pulsed-discharge and a theta-pinch were used to record Kr spectra in the region of 33... more A capillary pulsed-discharge and a theta-pinch were used to record Kr spectra in the region of 330–4800 Å. A set of 168 transitions of these spectra were classified for the first time. We extended the analysis to twenty-five new energy levels belonging to 3s23p24d, 3s23p25d even configurations. We calculated weighted transition probabilities (gA) for all of the experimentally observed lines and lifetimes for new energy levels using a relativistic Hartree–Fock method, including core-polarization effects.
Three-times ionized xenon Xe IV spectrum in the 1070–6400 Å region was analyzed using a pulsed di... more Three-times ionized xenon Xe IV spectrum in the 1070–6400 Å region was analyzed using a pulsed discharge light source. A set of 163 transitions was classified for the first time, and 36 new energy levels belonging to the 5s25p26d and 5s25p27s even configurations were determined. The relativistic Hartree–Fock method, including core-polarization effects, were used. In these calculations, the electrostatic parameters were optimized by a least-square procedure in order to improve the adjustment to experimental energy levels. We also present a calculation based on a relativistic multiconfigurational Dirac–Fock approach.
A pulsed discharge light source was used to study the two and three times ionized argon (Ar II, A... more A pulsed discharge light source was used to study the two and three times ionized argon (Ar II, Ar III) spectra in the 480–6218 Å region. A set of 129 transitions of Ar III and 112 transitions of Ar IV were classified for the first time. We extended the analysis of Ar III to five new energy levels belonging to 3s23p34d, 3s23p35s odd configurations. For Ar IV, 10 new energy levels of the 3s23p23d and 3s23p24p even and odd configurations, respectively, are presented. For the prediction of energy levels, line transitions, and transition probabilities, relativistic Hartree–Fock calculations were used.
A pulsed discharge light source to study the six and seven times ionized xenon spectra in the 419... more A pulsed discharge light source to study the six and seven times ionized xenon spectra in the 419–4642 Å region was used. A set of 40 transitions of Xe VII and 25 transitions of Xe VIII were classified for the first time. We revised the values for the previously known energy levels and extended the analysis for Xe VII to 10 new energy levels belonging to 5s6d, 5s7s and 5s7p, 4d95s25p even and odd configurations, respectively. Seven new energy levels of the core excited configuration 4d95s5d of Xe VIII are presented. For the prediction of the atomic parameters, energy levels, and transition, relativistic Hartree–Fock calculations were used.
A capillary discharge tube was used to record the Xe spectrum in the 400-5500 Å region. A set of ... more A capillary discharge tube was used to record the Xe spectrum in the 400-5500 Å region. A set of 243 lines of the Xe vi spectrum was observed, and 146 of them were classified for the first time. For all known lines, we calculated the weighted oscillator strengths (gf) and weighted transition probabilities (gA) using the configuration interaction in a relativistic Hartree-Fock approach. The energy matrix was calculated using energy parameters adjusted to fit the experimental energy levels. Core polarization effects were taken into account in our calculations. Experimental energy values and calculated lifetimes are also presented for a set of 88 levels. From these levels, 32 were classified for the first time and 33 had their values revised. Our analysis of the 5s5p5d and 5s5p6s configurations was extended in order to clarify discrepancies among previous works.
The thirteen times ionized tungsten is isoelectronic with PmI. Wavelengths and transition probabi... more The thirteen times ionized tungsten is isoelectronic with PmI. Wavelengths and transition probabilities for the 5s-5p and 5p-5d transitions of WXIV, identifying the ground state as 4f 13 5s 2 2 F 7/2 were calculated. Both, a relativistic Hartree Fock approach, including core-polarization effects, and a purely relativistic multiconfiguration Dirac-Fock method were used for the calculations. Particularly, 5s-5p transitions were compared with experimental results obtained with VUV electron beam ion trap (EBIT) spectroscopy.
The spectrum of Xe + has been observed in the S70-6900-A range. The previous analysis has been re... more The spectrum of Xe + has been observed in the S70-6900-A range. The previous analysis has been re- vised and extended. Al) levels of the ground configuration (Ss2Sp3} and of the SsSp configuration are now established,
The spectrum of triply ionized xenon {XeIv) has been observed in the region 570-6900 A. The confi... more The spectrum of triply ionized xenon {XeIv) has been observed in the region 570-6900 A. The configurations Ss 5p Sd and 5s 5p 6s have been studied and the energy levels reported for these configurations by Moore [(Atomic Energy Levels, Natl. Bur. Stand. Ref. Data Ser. , Natl. Bur. Stand. (U.S.) Circ. No. 467 (U.S. GPO, Washington, D.C. , 1971)] were revised and extended to include seven new levels. The configuration 5s5p was included in the analysis to take into account the strong interaction between this configuration and Ss'5p 5d. Configuration-interaction Rydberg series have been also included in the calculations. This investigation was supported by Hartree
The spectrum of doubly ionized xenon has been investigated. The study is based on photographic re... more The spectrum of doubly ionized xenon has been investigated. The study is based on photographic recordings of xenon spectra in the 490-8900 À range. The number o f classified lines has been increased from about 300 to about 1400. The lines have been classified as transitions between 73 even levels belonging to the 5s2 Sp4, S^Sp^ôp, 4/, 5 / and 5r°5/>6 configurations, and 83 odd levels belonging to the 5sSps, 5s15/r* 6s, 7s, 5d and 6d configurations. In particular, the classifications include most o f the Xe III laser lines. The experimentally observed level structures are compared with the results of Hartree-Fock calculations and least-squares fits. A comparison is also made between the results o f the present analysis and the published data on the Xe N 4 .OO Auger spectrum.
T he ground-state configuration o f five times ionized argon, (A r5+), is 3s23p with the term 2P.... more T he ground-state configuration o f five times ionized argon, (A r5+), is 3s23p with the term 2P. Ar V I belongs to the Al I isoelectronic sequence. Excited states either belong to simple one-electron configuration o f the type 3s2nl or to threeelectron configurations such as 3s3p2, 3p 3 and 3s3p(1,3P)n/ etc., giving both doublets and quartets. T he spectra o f the first, second and third elem ents in this sequence are presented in A tom ic Energy Levels (AEL), Ref. [1 ]. Subsequent to this tabulation, the Al I spectrum was investigated by Eriksson and Isberg [2 ]. Results about Si II were published by Shenstone [3 ] and the P III spectrum w as studied by M agnusson and Zetterberg [4 ]. Early results o n the spectra o f S IV and Cl V have been published in A E L but later results o f S IV were com piled by M artin et al., see Ref. [5 ] and references therein. T he first results about the spectrum o f Ar VI in the vacuum ultraviolet were published by Phillips and Parker [6 ]. Faw cett et al. [7 ] studied the spectra o f m ultiple ionized inert gases, including Ar, and Schönheit [8 ] m ade a similar study finding a large quantity o f new lines. Lines corresponding to the spinforbidden resonance multiplet 3s23p 2P-3 s3 p 2 4P were reported by Ekberg and Svensson [9 ]. U sing a Theta-Pinch light source Fawcet et al. [1 0 ] classified som e lines o f Ar VI.
The spectrum of Kr VI was recorded in the 23-254-nm-wavelength range, resulting in 109 new line c... more The spectrum of Kr VI was recorded in the 23-254-nm-wavelength range, resulting in 109 new line classifications. From these data we were able to identify 22 new energy levels belonging to the 4s4p4d and the 4s4p5s configurations. The levels belonging to the 4s 2 5p and the 4s 2 4f configurations and the levels 4s4p 2 2 S 1/2 and 4p 3 2 P 1/2 have new energy values proposed. The results are supported by isoelectronic extrapolation and multiconfiguration Hartree-Fock calculations with relativistic corrections. The experimental data were obtained from a capillary-discharge tube and theta-pinch light sources.
Journal of Physics B: Atomic, Molecular and Optical Physics, 2002
In s t it u t e o f P h y s ic s P u b l is h in g J o u r n a l o f Ph y s ic s B: At o m ic , M... more In s t it u t e o f P h y s ic s P u b l is h in g J o u r n a l o f Ph y s ic s B: At o m ic , M o l e c u l a r a n d Opt ic a l Ph y s ic s New energy levels of the 4s24p5s, 4s24p4d and 4s24p5p configurations of the Kr v spectrum Energy levels of Kr i to Kr xxxvi were reviewed and compiled by Sugar and Musgrove (1991) and tables of the classified lines of Kr v to Kr xxxvi were compiled by Shirai e t a l (1995). Four-times-ionized krypton, Kr v, belongs to the Ge i isoelectronic sequence and has the ground configuration 4s24p2. The spectra of the first, second, third and fourth elements of this sequence were presented in the book A to m ic E nergy L evels (Moore 1971). The As n spectrum was reinvestigated by Li and Andrew (1971) and the Br rv spectrum was revised by Joshi and Budhiraja (1971). The krypton isonuclear sequence has also been studied in different works by members of the Centro de Investigaciones Opticas Group, La Plata, Argentina and the Campinas Group, Sao Paulo, Brazil. Reyna Almandos et a l (1996,1998) published new energy levels for Kr hi and Kr iv. Pagan e t al (1995) reported the study of the 4s4p4d and 4s4p5s configurations of Kr vi and Raineri et al (2000) presented the spectroscopic analysis of the 4p4d configuration of Kr v i i. All these experiments were carried out using a discharge tube and a theta pinch discharge.
One of the major advantages of proton or ion beams, applied in cancer treatment, is their excelle... more One of the major advantages of proton or ion beams, applied in cancer treatment, is their excellent depthdose profile exhibiting a low dose in the entrance channel and a distinct dose maximum (Bragg peak) near the end of range in tissue. In the region of the Bragg peak, where the protons or ions are almost stopped, experimental studies with low-energy particle beams and thin biological samples may contribute valuable information on the biological effectiveness in the stopping region. Such experiments, however, require beam optimization and special dosimetry techniques for determining the absolute dose and dose homogeneity for very thin biological samples. At the National Centre of Accelerators in Seville, one of the beam lines at the 3 MV Tandem Accelerator was equipped with a scattering device, a special parallelplate ionization chamber with very thin electrode foils and target holders for cell cultures. In this work, we present the calibration in absolute dose of EBT3 films [Gafchromic radiotherapy films, http://www.ashland .com/products/gafchromic-radiotherapy-films] for proton energies in the region of the Bragg peak, where the linear energy transfer increases and becomes more significant for radiobiology studies, as well as the response of the EBT3 films for different proton energy values. To irradiate the films in the Bragg peak region, the energy of the beam was degraded passively, by interposing Mylar foils of variable thickness to place the Bragg peak inside the active layer of the film. The results obtained for the beam degraded in Mylar foils are compared with the dose calculated by means of the measurement of the beam fluence with an ionization chamber and the energy loss predicted by SRIM2008 code.
Se presenta en esta comunicación una nueva técnica holográfica por doble exposición, para el estu... more Se presenta en esta comunicación una nueva técnica holográfica por doble exposición, para el estudio de deformaciones colocando un interferograma entre el objeto a analizar y un me dio de registro fotográfico. Este novedoso método permite la obtención simultánea de los datos cuantitativos y de la estruc tura topográfica de la deformación. Se destaca su simplicidad,
A liquid air refrigerated crossed field stimulated emitter was constructed to observe the 0-0 UV ... more A liquid air refrigerated crossed field stimulated emitter was constructed to observe the 0-0 UV (337,1 nm) laser band of molecular nitrogen. The spectral analysis clearly showed that only one of the Λ-doublets were observed. The Λ-doublet components belong to two different Fortrat parabolas. This result allows a critical discussion of previous publications on the same subject.
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