Research Papers in Physics and Astronomy

 

Date of this Version

February 2008

Comments

DOI: 10.1134/S0021364008020069
Published in JETP Letters, 2008, Vol. 87, No. 2, pp. 92–97. Copyright © Pleiades Publishing, Ltd., 2008.
Original Russian Text © N.L. Manakov, A.F. Starace, A.V. Flegel, M.V. Frolov, 2008, published in Pis’ma v Zhurnal Éksperimental’noĭ i Teoreticheskoĭ Fiziki, 2008, Vol. 87, No. 2, pp. 99–104.

Abstract

Effective-range theory is developed to describe the processes of multiphoton bremsstrahlung absorption and the emission of laser radiation that accompanies the scattering of electrons from atoms in a laser field. It is found that the cross sections for multiphoton absorption in the plateau region increases resonantly for electron energies corresponding to the thresholds of induced bremsstrahlung (i.e., multiples of the photon energy). It is shown that this effect is caused by the laser-field modified threshold phenomena in the cross sections for multichannel reactions (Baz’ threshold anomalies).

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