Laser-assisted (e, 2e) collisions in helium

Joachain, Charles; Makhoute, A.; Maquet, Alfred; Taïeb, Richard

doi:10.1007/bf01429264

Cited by 11 publications

(9 citation statements)

References 11 publications

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“…This class of radial amplitudes ( 19) can be conveniently calculated by using a Sturmian approach. In fact, in order to double check our numerical results, we have used two different methods, namely: (i) Sturmian expansion of the Coulomb Green function [16,17,23], and (ii) Sturmian expansion of the first-order perturbed wavefunction [17,18].…”

Section: Theorymentioning

confidence: 99%

Light polarization effects in laser-assisted elastic electron-helium collisions: a Sturmian approach

Khalil

Akramine

Makhoute

et al. 1998

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

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We study the scattering of fast electrons by atoms in the presence of a strong laser field. Our method takes into account the 'dressing' of the target states by including the laser-atom interaction to first order, while the laser-projectile interaction is treated to all orders. The interaction of the fast incident electron with the target atom is treated in the first-Born approximation. Detailed calculations are performed for the 'elastic' scattering of 500 eV electrons by helium accompanied by the transfer of photons. We discuss the influence of the laser polarization on the differential cross sections as a function of the scattering angle, laser frequency and intensity.

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Section: Theorymentioning

confidence: 99%

Light polarization effects in laser-assisted elastic electron-helium collisions: a Sturmian approach

Khalil

Akramine

Makhoute

et al. 1998

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

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“…Therefore the calculation of the radial amplitudes (17) The radial amplitude (20) can be conveniently calculated by using a Sturmian approach. In order to double-check our numerical results we have used two different methods, which although relying both a Sturmian approach, differ somewhat in the practicalities of the computation.…”

mentioning

confidence: 99%

“…In order to double-check our numerical results we have used two different methods, which although relying both a Sturmian approach, differ somewhat in the practicalities of the computation. These methods are namely: i) Sturmian expansion of the Coulomb Green function [19][20].…”

mentioning

confidence: 99%

Effects of laser polarization in laser-assisted electron-helium inelastic collisions: a Sturmian approach

Akramine¹,

Makhoute²,

Khalil³

et al. 1999

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

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The influence of linearly and circularly polarized laser fields on the dynamics of fast electron-impact excitation in atomic helium is discussed. A detailed analysis is made in the excitation of 2 1 S, 3 1 S and 3 1 D dressed states of helium target. By using a semiperturbative treatment with the Sturmian basis expansion, we take into account the target atom distortion induced by a laser field. Important differences appear between the angular distributions depending on the different states of polarization, in particular the circular polarization presents an experimental interest. We give new features (intermediate resonances) for both polarizations, concerning the n = 2 states of helium for emission and the n = 3 for the absorption, in term of laser frequency. Qualitative differences from the case of laser-assisted elastic collisions have been evidenced.

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“…The latter two of these incorporate and pay particular attention to the target dressing effects of the laser and find the triply differential cross section (TDCS) to be strongly dependent on such effects. An application to electron impact ionisation of helium was first presented by Joachain et al [79] of which the same group published a very comprehensive work on the subject a few years later [80]. In which, the authors themselves state that the primary driver for their extension of the theory from hydrogen to helium is to provide additional incentive to perform such laser assisted collisions experiments.…”

Section: Soft Photon Approximation Implementation With CCCmentioning

confidence: 99%

Laser assisted electron dynamics

Bray¹

2016

Preprint

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I must firstly thank my supervisor, Professor Anatoli Kheifets, for without his time, effort, and guidance this project would not be possible. Thanks is also heartily due to Professor Igor Bray and the members of the Curtin University Institute of Theoretical Physics for access to the convergent close-coupling code base and their continued support in its use. I must also thank those who funded and orchestrated the Dunbar scholarship. Without their generosity I would not have had the opportunity to undertake my Honours year studies at the ANU. I also acknowledge the members of the School Computer Unit for their help in setting up technological access and all of the staff at the Pawsey Centre and the NCI for their continued efforts in providing the computational infrastructure that this project so heavily relied upon. Now I would like to that all those of whom their efforts helped to keep me (comparatively) sane throughout this year. Sam and Edmund for organising the Fenner Hall and ANU based table tennis. The many, many games played were a most welcome alternative to the hours spent on a computer and was a great source of challenge and fun. Brian, Ashley, and Ee-Faye for their efforts in running the Fenner Hall Ensemble. It was great to be able to crack out the ol' saxophone and be a part of such a fun and talented group. Yifa, Sihui, Yi, Abhijeet, Satomi, and Kirsty for their friendship and regular conversation over dinner. Helen, for her continued moral support from afar and hours upon hours worth of Skype and Facebook messages. Josh, for his lasting assistance throughout the year and in hunting down typos. Finally, I would like to thank Lunch Lord (or equivalent title) Matt and all my fellow Honours students. Each other's support made coursework all the more bearable and the weekly lunches with the ridiculous discussions they entailed were always a highlight. We all got there eventually! This work was supported by resources provided by the Pawsey Supercomputing Centre and the National Computing Infrastructure.

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Laser-assisted (e, 2e) collisions in helium

Cited by 11 publications

References 11 publications

Light polarization effects in laser-assisted elastic electron-helium collisions: a Sturmian approach

Light polarization effects in laser-assisted elastic electron-helium collisions: a Sturmian approach

Effects of laser polarization in laser-assisted electron-helium inelastic collisions: a Sturmian approach

Laser assisted electron dynamics

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