Second-order Born calculation of laser-assisted single ionization of helium by electrons

Makhoute, A.; Ajana, Imane; Khalil, D.; Chaddou, Souhaila

doi:10.1140/epjd/e2015-60141-5

Cited by 5 publications

(7 citation statements)

References 29 publications

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“…Hence, we have concluded that it is rather the description of the laser interaction that is the cause of the presented discrepancy, likely in that of the slow emitted electron which is heavily influenced by the laser field. This is the current consensus held within recent works [84,85] which have employed more nuanced descriptions of the target dressing effects and field-free scattering than the original Höhr et al paper [82], although in the field-free case not to the extent offered by the CCC. Nonetheless, neither of these works are able to rectify the presented discrepancy.…”

Section: Discussionmentioning

confidence: 89%

“…Additionally, in the most comprehensive description available of the electron impact of helium [80] they also state that the most obvious limitation of their description is the first Born treatment of the collisional stage of the calculation. More recent attempts of examining this discrepancy include incorporating second order Born terms for the field-free scattering event [84] and target dressing effects [85], which although each find significant differences with the addition of these aspects, remain unsuccessful in rectifying the situation. Hence, the application of a more comprehensive collisional theory to this problem which treats the projectile-target interaction to all orders will provide useful insight into the cause of this discrepancy.…”

Section: Soft Photon Approximation Implementation With CCCmentioning

confidence: 99%

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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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Section: Discussionmentioning

confidence: 89%

Section: Soft Photon Approximation Implementation With CCCmentioning

confidence: 99%

Laser assisted electron dynamics

Bray¹

2016

Preprint

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“…The semi-perturbative treatment of laser-assisted (e, 2e) reactions, described above for the case of an atomic hydrogen target, has been extended by Joachain et al [29], Khalil et al [31], Makhoute et al [32,44,46], Bouzidi et al [81] and Ajana et al [43,45] to laser-assisted (e, 2e) reactions in helium, for which the possibilities of performing experiments are more favorable. These studies also showed that the choice of the laser parameters can strongly influence the dynamics of such processes, and that target-dressing effects can be important.…”

Section: The Semi-perturbative Methodsmentioning

confidence: 99%

“…Thus the need for a more refined theory cannot be over emphasized, as was also pointed out by Hörr et al [20]. This motivated us to attempt many works that study the laser-assisted single ionization of hydrogen and helium atoms in the Ehrhardt asymmetric geometry using a second-order Born calculation [41][42][43][44][45][46]. Our group have also studied the symmetric case by restricting to a first Born treatment [47,48].…”

Section: Introductionmentioning

confidence: 95%

Laser-Assisted (e, 2e) Collisions in the Symmetric/Asymmetric Coplanar Geometry

Makhoute

Khalil

Ajana

2019

Atoms

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In this review, we present a comprehensive survey of laser-assisted (e, 2e) reactions. The influence of a laser field on the dynamics of (e, 2e) collisions in atomic hydrogen is analyzed in the symmetric and asymmetric coplanar geometries. Particular attention is devoted to the construction of the dressed (laser-modified) target wave functions, in both the initial and final states. The calculation is performed in the framework of Coulomb-Volkov-Born approximation, where the initial and final electrons are described by Volkov wave functions, while the interaction of the incident electron with the target atom is treated in the first and the second Born approximation. The state of the ejected electron is described by a Volkov/Coulomb-Volkov wave function. A detailed account is also given of the techniques we have used to evaluate the scattering amplitudes. The influence of the laser parameters (frequency, intensity, and direction of polarization) on the angular distribution of the ejected electron is discussed, and a number of illustrative examples are given. The structure of the triple differential cross section in the vicinity of resonances is also analyzed.

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“…The absence of any experimental data adds furtherimportance to the theoretical study of such a process. In this paper, we want to extend our previous studies [19][20][21][22][23] on laser-assisted electronimpact single ionization processes in the the Ehrhardt asymmetric coplanar geometry to the case of the symmetric energy sharing kinematics.…”

Section: Introductionmentioning

confidence: 99%

Laser-assisted (e, 2e) collisions in the coplanar symmetric geometry

Ajana

Agueny

Khalil

et al. 2018

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

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The theory of fast coplanar symmetric (e, 2e) reactions is analyzed. The calculation is performed in the framework of Coulomb-Volkov-Born approximation, where the initial and final electrons are described by Volkov wave functions, while the interaction of the fast incident electron with the target atom is treated in the first Born approximation. The state of the ejected electron is described by a Coulomb-Volkov wave function. We have considered two (e, 2e) spectroscopy regimes: (i) the regime in which the momentum transfer K is large, but the recoil momentum Q of the ion is small or moderate; and (ii) the regime of large K and large Q. The influence of the laser frequency on the angular distribution is analyzed and several illustrative examples are discussed.

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Second-order Born calculation of laser-assisted single ionization of helium by electrons

Cited by 5 publications

References 29 publications

Laser assisted electron dynamics

Laser assisted electron dynamics

Laser-Assisted (e, 2e) Collisions in the Symmetric/Asymmetric Coplanar Geometry

Laser-assisted (e, 2e) collisions in the coplanar symmetric geometry

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