Journal
JOURNAL OF EXPERIMENTAL AND THEORETICAL PHYSICS
Volume 100, Issue 1, Pages 22-30Publisher
PLEIADES PUBLISHING INC
DOI: 10.1134/1.1866195
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We use the saddle-point method to derive analytical expressions for the spectral-angular probability distributions of the ionization by a strong linearly polarized laser field in Keldysh's model that are valid for an arbitrary electron energy and adiabaticity parameter. We obtain asymptotic expansions of the general formulas in the multiphoton and tunneling regimes, analyze their accuracy, and formulate the validity conditions. We provide literal estimates of the parameters that characterize the properties and evolution of the distributions. (C) 2005 Pleiades Publishing, Inc.
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