Laser-assisted electron momentum spectroscopy

Journal Article · Sun Aug 15 00:00:00 EDT 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.82.023410· OSTI ID:21448527

Kouzakov, Konstantin A; Popov, Yuri V; Takahashi, Masahiko ^[1]

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1. Department of Nuclear Physics and Quantum Theory of Collisions, Faculty of Physics, Moscow State University, Moscow 119991 (Russian Federation)

We consider theoretically ionization of an atomic target by fast electron impact at large energy and momentum transfer and in the presence of laser radiation. The laser electric-field amplitude is weak compared to the typical field in the target. Two frequency regimes are investigated according to whether the laser frequency is (i) much smaller than or (ii) resonant to the frequency of the transition from the ground to the first excited target state. Fast incident, scattered, and ejected electrons are described using Volkov solutions. The dressing of the bound-electron state by the laser field is accounted for within time-dependent perturbation theory in the case of the low-frequency regime and within the rotating wave approximation in the case of a resonant one. The interaction of the incident electron with the target is treated in the first Born approximation. For atomic hydrogen embedded in a linearly or circularly polarized laser field, we discuss how the polarization-vector orientation influences the momentum-dependent (e,2e) differential cross sections assisted by exchange of few photons between the colliding system and the field. In addition, we inspect the dependence of the cross sections on the dressing of the hydrogen state.

• OSTI ID: 21448527
• Journal Information: Physical Review. A, Vol. 82, Issue 2; Other Information: DOI: 10.1103/PhysRevA.82.023410; (c) 2010 The American Physical Society; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
BORN APPROXIMATION
DIFFERENTIAL CROSS SECTIONS
ELECTRIC FIELDS
ELECTRON COLLISIONS
ELECTRON SPECTROSCOPY
ELECTRONS
EXCITED STATES
GROUND STATES
HYDROGEN
IONIZATION
LASER RADIATION
MATHEMATICAL SOLUTIONS
MOMENTUM TRANSFER
ORIENTATION
PERTURBATION THEORY
PHOTONS
POLARIZATION
APPROXIMATIONS
BOSONS
CALCULATION METHODS
COLLISIONS
CROSS SECTIONS
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
ELEMENTS
ENERGY LEVELS
FERMIONS
LEPTONS
MASSLESS PARTICLES
NONMETALS
RADIATIONS
SPECTROSCOPY