Luc Eliane

Université Paris-Saclay / UPSaclay, Physique, Emerita

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Oleg Yu Vorobyev

Siberian Federal University

Illan rua Wall

University of Galway

David Seamon

Kansas State University

Mariafelicia De Laurentis

Università degli Studi di Napoli "Federico II"

Abhas Mitra

Homi Bhabha National Institute (HBNI, BARC, MUMBAI)

Jack Sarfatti

Cornell University

Raphaël Gély

Université catholique de Louvain

Andrea Mubi Brighenti

University of Trento

Richard Gauthier

Santa Rosa Junior College

Yasser Shekofteh

Shahid Beheshti University

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Papers by Luc Eliane

Lifetime of vibrational levels from Fourier grid calculations: RbCs example

Physical Chemistry Chemical Physics, 2011

We present systematic calculations of the lifetimes of vibrational levels of excited Rb(5s)Cs(6p(... more We present systematic calculations of the lifetimes of vibrational levels of excited Rb(5s)Cs(6p(1/2)) 0(+) electronic states. We show that a precise description of the variation with the internuclear distance of the transition dipole moment between electronic states is essential. It is also crucial to account precisely for the spin-orbit coupling between the Rb(5s)Cs(6p) A (1)Σ(+) and b (3)Π states. We describe the general trends of the probability of formation of stable molecules in the Rb(5s)Cs(6s) X (1)Σ(+) and a (3)Σ(+) electronic states, through radiative decay from the 0(+)v&#39; levels, together with the branching ratios for the obtention of singlet or triplet molecules, stable with respect to dissociation. Furthermore, this analysis allows us to demonstrate the efficiency of the Mapped Fourier Grid Hamiltonian Representation method (MFGHR) to determine rigorously the energy variation, throughout the continuous part of the spectrum, of the density of an observable connecting bound vibrational levels and continuum states. The resolution in energy can be adapted to the studied problem through a judicious choice of the grid parameters.

Shape resonances in ground-state diatomic molecules: General trends and the example of RbCs

Physical Review A, 2010

Climate change mitigation remains a contested political and policy issue nationally in Australia.... more Climate change mitigation remains a contested political and policy issue nationally in Australia. Nevertheless, Australian cities have been actively engaging with low carbon policy for well over a decade and numerous actions and programs have resulted. A question arises as to whether such initiatives can amount to a transition; a systemic change from one dominant fossil-fuel based socio-technical regime, to another, fossil-free based socio-technical regime. In this paper, we review the critical literature on low carbon governance and socio-technical transitions and present a set of criteria by which we propose it is possible to assess the emergence of and/or progress towards low carbon urban transition. We then apply this approach to a case study. The paper presents findings from a review of low carbon initiatives in Australia with a particular focus on Melbourne, Victoria exploring the policy context in which these initiatives and responses have emerged, the typical approaches adopted and the implications for urban change and governance. We examine the roles of, and relationships between, different levels of government, climate change alliances, community/environmental organisations and other actors, and assess progress of the urban low carbon transition. In so doing, we identify significant shortcomings and policy disconnects which we argue are limiting progress towards a low carbon future in Victoria.

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Electric-dipole transition probabilities of Al-like ions

Atomic Data and Nuclear Data Tables, 1982

Theoretical wavelengths, oscillator strengths, and transition probabilities for the El-transition... more Theoretical wavelengths, oscillator strengths, and transition probabilities for the El-transitions between levels of the ground complex (n = 3)3 of the Al-like ions are presented. Calculations are made for 27 ions of the Al-sequence up to 2 = 93. The Relativistic Parametric Potential Method was used to calculate energy levels and wave functions. All configuration interactions within the ground complex are included to account for electron correlations and intermediate coupling. Relativistic effects are taken into account by means of the Coulomb-Dirac Hamiltonian. The Breit term and the Lamb shift are neglected.

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Femtosecond pulses and dynamics of molecular photoexcitation: RbCs example

Physical Review A, 2012

We investigate the dynamics of molecular photoexcitation by unchirped femtosecond laser pulses us... more We investigate the dynamics of molecular photoexcitation by unchirped femtosecond laser pulses using RbCs as a model system. This study is motivated by a goal of optimizing a two-color scheme of transferring vibrationally-excited ultracold molecules to their absolute ground state. In this scheme the molecules are initially produced by photoassociation or magnetoassociation in bound vibrational levels close to the first dissociation threshold. We analyze here the first step of the two-color path as a function of pulse intensity from the low-field to the high-field regime. We use two different approaches, a global one, the 'Wavepacket' method, and a restricted one, the 'Level by Level' method where the number of vibrational levels is limited to a small subset. The comparison between the results of the two approaches allows one to gain qualitative insights into the complex dynamics of the high-field regime. In particular, we emphasize the non-trivial and important role of far-from-resonance levels which are adiabatically excited through 'vertical' transitions with a large Franck-Condon factor. We also point out spectacular excitation blockade due to the presence of a quasi-degenerate level in the lower electronic state. We conclude that selective transfer with femtosecond pulses is possible in the low-field regime only. Finally, we extend our single-pulse analysis and examine population transfer induced by coherent trains of low-intensity femtosecond pulses.

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Doublet inversions in alkali-metal spectra: Relativistic and correlation effects

Physical Review A

It is shown that in the central-field approximation, a relativistic calculation reproduces the in... more It is shown that in the central-field approximation, a relativistic calculation reproduces the inverted fine structures experimentally observed in the series of excited sodium nd (3 & n & 16) and cesium nf (4 & n & 12) terms. Tneoretical results are in good agreement with measured values. In view of the simplicity of the method used, it can easily be applied to all the states of a given Rydberg series. This work brings to light the fact that a complete relativistic treatment (which introduces automatically the relativistic contributions on the large components of the wave functions) is equivalent to a multiconfigurational expansion of nonrelativistic wave functions taking into account relativistic corrections (in the low-Z Pauli limit).

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Oscillator strength ratios for the principal series of rubidium : relativistic and correlation effects

ABSTRACT

Relativistic calculation of the Breit-Margenau correction in a many-electron atom

Journal of Physics B Atomic and Molecular Physics

ABSTRACT

Fine-structure splitting for the 3d and 4d terms in the sodium isoelectronic sequence

2014 Les intervalles de structure fine pour les termes 3d et 4d de la séquence isoélectronique du... more 2014 Les intervalles de structure fine pour les termes 3d et 4d de la séquence isoélectronique du sodium, jusqu'à Sn XL, sont calculés à partir des fonctions d'onde relativistes obtenues par la méthode du potentiel paramétrique. Pour tous les ions étudiés, on obtient un bon accord avec les valeurs expérimentales. On analyse les différentes contributions à l'intervalle de structure fine, ainsi que leur variation le long de la séquence. Dans un traitement par perturbation des effets relativistes, il apparait deux types de contribution : les corrections d'opérateur effectif et les effets purement relativistes, ces derniers étant associés aux corrections de fonction d'onde. Les premières contributions sont prédominantes pour des degrés d'ionisation suffisamment élevés, par contre les effets purement relativistes sont prépondérants dans l'étude des éléments légers puisqu'ils permettent d'expliquer les inversions de structure fine observées expérimentalement. Abstract. 2014 The fine-structure splitting for the 3d and 4d terms of the Na I isoelectronic sequence up to Sn XL are calculated using relativistic wavefunctions obtained by means of the relativistic parametric potential method. Good agreement with experimental data is obtained throughout the sequence. The different contributions to the spin-orbit constant are analysed and their variations along the sequence are discussed. In the Pauli approximation the relativistic effects separate into effective operator contributions and purely relativistic effects associated with relativistic corrections to the wavefunctions ; it is shown that the former effect is predominant for high stages of ionization, meanwhile the latter correction corresponds to the most important contributions for the first ions of the sequence and accounts for the fine-structure inversion.

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Interpretation of Electric-Field-Induced Oscillations in the Cross Section of a One-Electron Atom above the Ionization Limit

Physical Review Letters, 1979

... E. Luc-Koenig and A. Bachelier Laboratoire Aime Cotton, Centre ¹tional de laRechercke Scienti... more

Systematic theoretical study of the Stark spectrum of atomic hydrogen. I - Density of continuum states

Journal of Physics B-atomic Molecular and Optical Physics - J PHYS-B-AT MOL OPT PHYS, 1980

The paper reports an exact method which obtains normalized wavefunctions for a hydrogen-like atom... more The paper reports an exact method which obtains normalized wavefunctions for a hydrogen-like atom in the presence of a uniform electric field. An unambiguous classification of the Stark state is presented which correlates a given Stark state to a unique zero-field state; this classification is valid for any Stark state (resonant or nonresonant), and at any energy smaller or greater than the E sub zero (the ionization potential of the unperturbed atom). For the supersymmetry in the hydrogen spectrum, states with different values of m, the magnetic quantum number, or n sub 1, the generalized parabolic quantum number, can be considered independently. A parabolic critical energy can be defined for any state m, n sub 1; for sufficiently high value of n sub 1, the critical energy is greater than E sub zero. A systematic study of the positions and widths of the resonances in a broad energy range below E sub zero is presented.

Etude de la transition ``interdite'' 2P1/2 --> 2P3/2 de la configuration np5 dans le brome et l'iode par spectrometrie de fourier

Physica, 1973

ABSTRACT

Exact stabilisation versus approximate stabilisation of a Stark state through ionising-channel interference

Journal of Physics B: Atomic and Molecular Physics

ABSTRACT

Rydberg atoms in external electric and magnetic fields

Non-relative energies from relativistic radial integrals in atoms and ions

Journal of Physics B: Atomic and Molecular Physics, 1982

ABSTRACT New formulae are proposed for deriving, from ab initio relativistic results, non-relativ... more ABSTRACT New formulae are proposed for deriving, from ab initio relativistic results, non-relativistic approximations for the energy radial integrals relevant to the Coulomb and spin-orbit atomic interactions. For some of the electronic Slater integrals these formulae must replace those found in the literature. In the spin-orbit integrals, all contributions from the Breit-Dirac Hamiltonian are included and discussed.

Radiative and non-radiative decays of doubly-excited configurations in the Ar7+ spectrum

Journal of Physics B-atomic Molecular and Optical Physics - J PHYS-B-AT MOL OPT PHYS, 1990

A configuration-average method is developed to investigate the properties of multiply-excited con... more A configuration-average method is developed to investigate the properties of multiply-excited configurations of many-electron ions produced during multiple-electron capture collisions. For doubly-excited configurations of Ar7+ lying below the 2p55s ionisation limit, the average energy is calculated and a classification into core-excited Rydberg series is presented. The energy range spanned by Wannier-type configurations 2p5N'n with N approximately=n also includes high members of the Rydberg series with N<<n. The radiative and non-radiative decay rates are calculated and the cascade processes from excited configurations are analysed explicitly. The stabilisation ratio R(N', n), defined as the probability of reaching non-autoionising configurations of Ar7+ during the cascades from the configuration 2p5N'n, is calculated for all configurations with N<or=5, n<or=9. Its dependence on the quantum numbers N, n, and on the energy of the configuration is investigat...

Threshold effects in the photoassociation of cold atoms: R− 6 model in the Milne formalism

… of Physics B: Atomic, Molecular and …, 2006

... Threshold effects in the photoassociation of cold atoms: R −6 model in the Milne formalism An... more

Resonant coupling effects on the photoassociation of ultracold Rb and Cs atoms

Physical Review A, 2009

In the polar RbCs molecule, the strong spin-orbit coupling between the ASigma+1 and bPi3 diabatic... more In the polar RbCs molecule, the strong spin-orbit coupling between the ASigma+1 and bPi3 diabatic electronic states correlated to the Rb(5s)Cs(6p) dissociation limit is at the origin of a global mixing of the two vibrational 0+(P1/2,3/2) series coupled radiatively to both XSigma+1 and aSigma+3 states. This so-called ``resonant coupling'' plays a crucial role in the formation of ultracold stable RbCs molecules through photoassociation into 0+ levels followed by stabilization through spontaneous emission. We analyze quantitatively the mechanisms of photoassociation and stabilization through 0+ levels, starting from and leading to either the singlet or the triplet states and we compare the efficiency of the four paths leading to the formation of stable RbCs molecules. Comparison between the two isotopomers Rb87Cs133 and Rb85Cs133 is also reported: the overall process of formation of stable molecules is one order of magnitude larger for Rb87Cs . The simple two-channel model presented here yields the general rules for a standard analysis of the effects of resonant coupling between electronic states. To underline the specificity of heteronuclear molecules, the 0+ coupled system of the RbCs molecule is compared to its analog, the 0u+ system of the Rb2 molecule.

Relativistic effects on transition probabilities in the Mg isoelectronic sequence

Physical Review A

Relativistic effects on transition probabilities in the Li and Be isoelectronic sequences. Lloyd ... more

Experimental and theoretical study of Stark patterns in Rb Rydberg levels

Physical Review A

ABSTRACT

Influence of the Earth Magnetic Field of the Photoionization Stark Spectrum of Excited Sodium Atoms

Lifetime of vibrational levels from Fourier grid calculations: RbCs example

Physical Chemistry Chemical Physics, 2011

Shape resonances in ground-state diatomic molecules: General trends and the example of RbCs

Physical Review A, 2010

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Electric-dipole transition probabilities of Al-like ions

Atomic Data and Nuclear Data Tables, 1982

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Femtosecond pulses and dynamics of molecular photoexcitation: RbCs example

Physical Review A, 2012

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Doublet inversions in alkali-metal spectra: Relativistic and correlation effects

Physical Review A

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Oscillator strength ratios for the principal series of rubidium : relativistic and correlation effects

ABSTRACT

Relativistic calculation of the Breit-Margenau correction in a many-electron atom

Journal of Physics B Atomic and Molecular Physics

ABSTRACT

Fine-structure splitting for the 3d and 4d terms in the sodium isoelectronic sequence

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Interpretation of Electric-Field-Induced Oscillations in the Cross Section of a One-Electron Atom above the Ionization Limit

Physical Review Letters, 1979

... E. Luc-Koenig and A. Bachelier Laboratoire Aime Cotton, Centre ¹tional de laRechercke Scienti... more

Systematic theoretical study of the Stark spectrum of atomic hydrogen. I - Density of continuum states

Journal of Physics B-atomic Molecular and Optical Physics - J PHYS-B-AT MOL OPT PHYS, 1980

Etude de la transition ``interdite'' 2P1/2 --> 2P3/2 de la configuration np5 dans le brome et l'iode par spectrometrie de fourier

Physica, 1973

ABSTRACT

Exact stabilisation versus approximate stabilisation of a Stark state through ionising-channel interference

Journal of Physics B: Atomic and Molecular Physics

ABSTRACT

Rydberg atoms in external electric and magnetic fields

Non-relative energies from relativistic radial integrals in atoms and ions

Journal of Physics B: Atomic and Molecular Physics, 1982

Radiative and non-radiative decays of doubly-excited configurations in the Ar7+ spectrum

Journal of Physics B-atomic Molecular and Optical Physics - J PHYS-B-AT MOL OPT PHYS, 1990

Threshold effects in the photoassociation of cold atoms: R− 6 model in the Milne formalism

… of Physics B: Atomic, Molecular and …, 2006

... Threshold effects in the photoassociation of cold atoms: R −6 model in the Milne formalism An... more

Resonant coupling effects on the photoassociation of ultracold Rb and Cs atoms

Physical Review A, 2009

Relativistic effects on transition probabilities in the Mg isoelectronic sequence

Physical Review A

Relativistic effects on transition probabilities in the Li and Be isoelectronic sequences. Lloyd ... more

Experimental and theoretical study of Stark patterns in Rb Rydberg levels

Physical Review A

ABSTRACT

Influence of the Earth Magnetic Field of the Photoionization Stark Spectrum of Excited Sodium Atoms

Luc Eliane

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