https://doi.org/10.1140/epjd/e2009-00254-x
Multiphoton (e, 2e) process of hydrogen atom in strong laser field
Department of Theoretical Physics, Indian Association for the Cultivation of
Science, Jadavpur, Kolkata, 700032, India
Corresponding author: a chand_sin@hotmail.com
Received:
30
January
2009
Revised:
5
June
2009
Published online:
26
September
2009
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 () and perpendicular
(⊥r) to the incident momentum, with a view
to comparing (qualitatively) the results with the recent kinematically
complete experiments of Höhr 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 (
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).
PACS: 34.80.Qb – Laser-modified scattering / 34.80.Dp – Atomic excitation and ionization
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2009