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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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