Adiabatic-limit Coulomb factors for photoelectron and high-order-harmonic spectra

Authors

M. V. Frolov, Voronezh State University, RussiaFollow
N. L. Manakov, Voronezh State UniversityFollow
A. A. Minina, Voronezh State University
S. V. Popruzhenko, Voronezh State University
Anthony F. Starace, University of Nebraska-LincolnFollow

Date of this Version

8-8-2017

Citation

PHYSICAL REVIEW A 96, 023406 (2017)

Comments

©2017 American Physical Society. Used by permission.

Abstract

A momentum-dependent Coulomb factor in the probability for nonlinear ionization of atoms by a strong low-frequency laser field is calculated analytically in the adiabatic approximation. Expressions for this Coulomb factor, valid for an arbitrary laser pulse waveform, are obtained and analyzed in detail for the cases of linear and circular polarizations. The dependence of the Coulomb factor on the photoelectron momentum is shown to be significant in both cases. Using a similar technique, the Coulomb factor for emission of high-order harmonics by an atom in a bichromatic laser field is also calculated. In contrast to the case of a single-frequency field, for bichromatic fields the Coulomb factor depends significantly on the harmonic energy.