This article is cited in 20 papers

ATOMS, SPECTRA, RADIATIONS

Threshold phenomena in the cross sections for atomic photoprocesses in a strong laser field

N. L. Manakov, M. V. Frolov

Voronezh State University

Abstract: Using the effective-range theory in the complex-quasienergy method for describing a weakly bound electron in a laser field, it has been shown that the cross sections for above-threshold ionization and generation of the high harmonics of laser radiation increase significantly (resonant-like) near the threshold of one of the multiphoton ionization channels. The dependence of the enhancement effects on the orbital angular momentum of the bound electron shows that these effects are caused by the threshold phenomena in the cross sections for multichannel reactions that are modified by the strong laser field.

PACS: 32.80.Qk, 34.50.Rk, 42.65.Ky

Received: 11.05.2006

 English version: Journal of Experimental and Theoretical Physics Letters, 2006, 83:12, 536–540

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