State propensities in electron transfer processes from optically prepared states:

Salgado, Jesús; Thomsen, J.; Andersen, N.; Dowek, D.; Dubois, Alain; Houver, J. C.; Nielsen, Svend Erik; Reiser, Ingrid; Svensson, Anders

doi:10.1088/0953-4075/30/13/013

Cited by 18 publications

(27 citation statements)

References 32 publications

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“…The study of charge transfer dynamics from laser-excited Na(3p) atoms has been mostly focused on collision energies corresponding to velocities around and below the expectation value of the electron velocity in the initial Na(3p) state [1][2][3]. At these projectile energies it is now well established that an expansion of the wavefunction in either atomic (AO) or molecular (MO) basis states is adequate and, in general, gives an excellent agreement with experiments for total and partial cross sections [4] and phase-dependent coherence parameters [3,5]. Recently, it has also been demonstrated that the classical trajectory Monte Carlo (CTMC) method gives the correct relative distribution for the H(n = 2) channels in capture from laser-excited Na(3p −1 ) [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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Orientation effects for collisions at energies beyond the `velocity-matching' region

Hansen

Nielsen

et al. 1998

J. Phys. B: At. Mol. Opt. Phys.

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Cross sections for electron capture in collisions between H + and laser-excited oriented Na(3p −1 ) atoms have been computed at intermediate energies (5-50 keV). A quantal method is used within the atomic orbital close-coupling approach as well as a purely classical model, i.e. the classical trajectory Monte Carlo method. Both methods are in good agreement over the entire energy range for total capture cross sections and partial n = 2 cross sections. At the level of state-to-state differential cross sections some differences between the two approaches become evident. The total probability for electron transfer in both methods turns out, however, always to be largest in left-hand side collisions where the projectile velocity can become parallel to (match) the electron velocity of the Na(3p −1 ) target.

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Section: Introductionmentioning

confidence: 99%

“…[15,16]. For capture from excited states the situation is less clear, but there are recent results for low collision energy [3,17].…”

Section: Introductionmentioning

confidence: 99%

Orientation effects for collisions at energies beyond the `velocity-matching' region

Hansen

Nielsen

et al. 1998

J. Phys. B: At. Mol. Opt. Phys.

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“…Note that, in the mean time, alignment [4] and orientation measurements with laser excited alkali targets had developed to establish propensity rules from the reversed process [10].…”

Section: In What Sense Is the Captured Electron Rotating ?mentioning

confidence: 99%

Revisiting Atomic Collisions Physics with highly charged ions, A tribute to Michel Barat

Roncin

2020

Preprint

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Michel Barat passed away in November 2018 at the age of 80 after a rich career in atomic and molecular collisions. He had participated actively in formalizing to the electron promotion model, contributed to low energy reactive collisions at the frontier of chemistry. He investigated electron capture mechanisms by highly charged ions, switched to collision induced cluster dissociation and finally to UV laser excitation induced fragmentation mechanisms of biological molecules. During this highly active time he created a lab, organized ICPEAC and participated actively in the administration of research. This paper covers the ten years where he mentored my scientific activity in the blossoming field of electron capture by highly charge ions (HCI). In spite of an impressive number of open channels, Michel found a way to capture the important parameters and to simplify the description of several electron capture processes; orientation propensity, electron promotion, true double electron capture, Transfer ionisation, Transfer excitation, formation of Rydberg states, and electron capture by metastable states. Each time Michel established fruitful collaborations with other groups.

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“…Electron transfer in ion-atom collisions has been widely investigated and is still a very active field [1][2][3][4][5][6][7][8][9]. Collisions of bare nuclei on H atoms have been of primary interest and have led to elaborate calculations.…”

Section: Introductionmentioning

confidence: 99%

Ab initiocalculation of the asymmetric electron transfer cross section in the low velocity collision

Charles

1998

J. Phys. B: At. Mol. Opt. Phys.

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The (HeLi) 4+ one-electron molecule has been studied and the electronic energies of the states n = 1-5 have been determined as a function of the distance R between the two nuclei, in the Born-Oppenheimer approximation. The radial and rotational matrix elements for electron transfer in the Li 3+ + He + collision have been computed and the system of 35 coupled equations describing the collision in the impact parameter approximation has been solved for an initial system composed of an incident Li 3+ ion and a He + target in the ground state. The signs of the different terms appearing in the radial matrix elements have been carefully re-examined and a clear resonance induced by the avoided crossing of the 5dσ and 4pσ states has been proven. The Li 3+ + He + → Li 2+ + He 2+ total electron transfer cross section is found to lie between those of the adjacent symmetric systems He 2+ + He + and Li 3+ + Li 2+ and, in this respect, may be called 'quasisymmetric transfer'.

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State propensities in electron transfer processes from optically prepared states:

Cited by 18 publications

References 32 publications

Orientation effects for collisions at energies beyond the `velocity-matching' region

Orientation effects for collisions at energies beyond the `velocity-matching' region

Revisiting Atomic Collisions Physics with highly charged ions, A tribute to Michel Barat

Ab initiocalculation of the asymmetric electron transfer cross section in the low velocity collision

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