Effects of a laser field on electron-atom ionizing collisions

Cavaliere, P.; Leone, Cláudio; Zangara, Rosalia; Ferrante, G.

doi:10.1103/physreva.24.910

Cited by 34 publications

(12 citation statements)

References 6 publications

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“…4c,d. Surprisingly, (and in disagreement with early calculations [23] as well as with the present predictions) the binary peak is enhanced under most of the dynamical conditions explored. Whereas the magnitude of the effect seems to be reasonably described by the calculations, the effect itself, i.e.…”

Section: Finally We Present Triply Differential Cross Sections Tdcssupporting

confidence: 55%

Electron Impact Ionization in the Presence of a Laser Field: A Kinematically Complete(nγe,2e)Experiment

et al. 2005

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Single ionization of He by 1 keV electron impact in the presence of an intense (I=4×10 12 W/cm 2 ) laser field (λ=1064 nm) has been explored in a kinematically complete experiment using a "Reaction Microscope". Distinct differences in the singly to fully differential cross sections compared to the field-free situation are observed which cannot be explained by a first-order quantum calculation.Major features, such as the number of photons exchanged and the modification of the energy spectrum of emitted electrons can be qualitatively understood within a simple classical picture.

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Section: Finally We Present Triply Differential Cross Sections Tdcssupporting

confidence: 55%

Electron Impact Ionization in the Presence of a Laser Field: A Kinematically Complete(nγe,2e)Experiment

et al. 2005

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“…The polarization vector of the fieldε (which is along E 0 for the case of linear polarization considered here) is set parallel to the impact momentum k i . The complete results obtained by using the ionization amplitude Equations (25) and (42) for the first and second Born approximations are compared with those obtained by neglecting the dressing of the target which coincide with the electronic amplitude f 1 and with field-free results. It is interesting to note that the results are notably sensitive to the second Born approximation at low incident electron energies.…”

Section: Resultsmentioning

confidence: 96%

“…At an early stage of this research field, theoretical studies treated this process by neglecting the target dressing effects and described the unbound electrons either as non relativistic Volkov or Coulomb-Volkov states [22][23][24][25][26][27][28]. Later on, Joachain and coworkers investigated the case of hydrogen [29,30], and helium targets [31,32], while considering the dressing of the atomic states.…”

Section: Introductionmentioning

confidence: 99%

“…A number of theoretical studies [24][25][26][29][30][31][32][34][35][36] were performed for hydrogen and helium atoms using different models in order to calculate TDCS at high initial energies. During the last few years, considerable progress has been achieved in the investigation of (e, 2e) phenomena at low and intermediate incident energy [37][38][39].…”

Section: Introductionmentioning

confidence: 99%

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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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“…So, our calculation is aimed at studying, in a simple way, how the noticed symmetries mix and may change the shape of the TDC compared to the field-free case. A similar calculation has been done also for electron-atom ionization (5). Thus an additional aim is to compare the effects for both the cases.…”

Section: Calculations and Commentsmentioning

confidence: 99%

Positron–hydrogen ionizing collisions in the presence of a laser field

Cavaliere¹,

Leone

Ferrante³

1982

Can. J. Phys.

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Triple differential cross sections (TDC) for positron-hydrogen ionization in the presence of a laser field are derived within a treatment which uses the Coulomb-Born wave approximation. The laser field is treated classically in the dipole approximation and taken to be homogeneous and single mode. Calculations are specialized to the case of a coplanar asymmetric geometry. The presence of the laser is found to alter significantly the shape of the angular distribution of the ejected electrons ;hen photon exchanges occur. Laser electric fields parallel to the positron transferred momentum (ELIIKi,) increase the number of electrons ejected in the forward direction, compared to the no-field case. Laser electric fields perpendicular to K,, double the peaks present in the field-free angular distribution and rotate them symmetrically in opposite directions from the K,,-axis towards the E L axis. The results for ionization by positrons are compared to those for ionization by electrons (within the same theoretical treatment). Differences are found only for EL(IKil. The limits of validity of the model are discussed, together with simple physical arguments to explain the modifications to the shape of the TDC.Des sections efficaces differentielles triplcs pour l'ionisation de I'hydrogene par des positrons en prCsencc d'un champ laser sont obtenues au moyen d'un traitement qui utilise I'approximation Coulomb-Born. LC champ laser est trait6 classiquement i I'approximation du dipfile et suppos6 homogene et unimodal. Les calculs sont effectuCs sptcialcment pour le cas d'une gComCtrie asymktrique coplanaire. On trouve que la presence du champ laser modifie de facon notable la forme de la distribution angulaire des Clectrons 6jectCs lorsquc des Cchanges de photons se produisent. Les champs Clectriques laser parallklcs au transfert d'impulsion du positron (EL(IK,,) accroissent le nombre des Clectrons CjcctCs dans la direction avant, en comparaison avec le cas ou il n'y a pas de champ laser. Les champs Clectriqucs laser perpendiculaires i K,, doublent les pics prCsents dans la distribution angulairc cn I'abscnce dc champ ct les font tourner symCtriqucmcnt dans des dircctions opposCes, de I'axe K,, vers I'axc EL. Lcs rCsultats obtenus pour I'ionisation par les positrons sont cornparts avcc ceux de I'ionisation par les Clectrons (avcc le m&me traitement thCoriquc). On ne trouvc dcs diffkrenccs que pour ELIIKlf. LCS limites de validit6 du modkle sont discutCes, et des arguments physiques simples sont prCsentCs pour expliquer les modifications dc la forme des sections efficaces diffCrentielles triples.[Traduit par lc journal]Can.

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Effects of a laser field on electron-atom ionizing collisions

Cited by 34 publications

References 6 publications

Electron Impact Ionization in the Presence of a Laser Field: A Kinematically Complete(nγe,2e)Experiment

Electron Impact Ionization in the Presence of a Laser Field: A Kinematically Complete(nγe,2e)Experiment

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

Positron–hydrogen ionizing collisions in the presence of a laser field

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