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Multiphoton (e, 2e) process of hydrogen atom in strong laser field
Authors:S. Ghosh Deb   S. Roy  C. Sinha
Affiliation:(1) Steacie Institute for Molecular Sciences, National Research Council of Canada, 100 Sussex Drive, Ottawa K1A 0R6, ON, Canada;(2) Physics Department, University of OttawaResearch Council of Canada, 150 Louis Pasteur, Ottawa K1N 6N5, ON, Canada
Abstract:The dynamics of the electron impact multiphoton ionization of a hydrogen atom in the presence of an intense laser field (e, n γ e) has been studied theoretically for laser polarization parallel (||lvert vert^{l}) and perpendicular (⊥r) to the incident momentum, with a view to comparing (qualitatively) the results with the recent kinematically complete experiments of H?hr et al. [Phys. Rev. Lett. 94, 153201 (2005)] for the He target. Significant laser modifications are noted in the present doubly (DDCS) and the fully differential multiphoton cross sections (TDCS) for both the geometries (||lvert vert^{l} and ⊥r). For most of the explored kinematics (chosen in accordance with the experiment), the present binary peak intensity of the laser-assisted multiphoton TDCS is significantly enhanced with respect to the field free ones, in qualitative agreement with the experiment. Importance of the multiphoton effects is also studied. The multiphoton cross sections in the zeroth order approximation of the ejected electron wavefunction (CV) obeys the Kroll Watson sum rule while it does not hold good in the corresponding first order approximation (MCV).
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