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Laser-assisted ionization-excitation of helium by electron impact at large momentum transfer

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Abstract

Ionization of a helium atom by electron impact in the presence of laser radiation is studied theoretically. The kinematic regime of high impact energy and large momentum transfer is considered. The S-matrix of the process is treated within the first Born and binary-encounter approximations. Triple differential cross sections are calculated for the cases when the residual He+ ion is left both in the ground (n = 1) and in the first excited (n = 2) states in the presence of a laser field with frequency ω = 1.55 eV and intensity I = 5 × 1011 W/cm2. The laser-assisted cross sections corresponding to n = 2 are found to be more sensitive to the electron-electron correlations in helium than the field-free ones.

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Authors and Affiliations

  1. Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Moscow Region, 141980, Dubna, Russia

    Andrey A. Bulychev

  2. Department of Nuclear Physics and Quantum Theory of Collisions, Faculty of Physics, Lomonosov Moscow State University, 119991, Moscow, Russia

    Konstantin A. Kouzakov

Authors
  1. Andrey A. Bulychev
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  2. Konstantin A. Kouzakov
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Correspondence to Andrey A. Bulychev.

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Bulychev, A.A., Kouzakov, K.A. Laser-assisted ionization-excitation of helium by electron impact at large momentum transfer. Eur. Phys. J. D 68, 354 (2014). https://doi.org/10.1140/epjd/e2014-50442-6

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  • DOI: https://doi.org/10.1140/epjd/e2014-50442-6

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