Multiphoton detachment in a static uniform magnetic field

Bo Gao
Phys. Rev. A 41, 5039 – Published 1 May 1990
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Abstract

Multiphoton detachment cross sections for a negative ion in a static, uniform magnetic field are obtained in the approximation that electron-atom interactions are ignored in the final state. The final state is described by the analytic momentum-space wave function for an electron in the combined field of a laser and a static uniform magnetic field. The effects of a static-field-induced electron-photon interaction are stressed. Three consequences of our general formulas are discussed. First, the ponderomotive shift is modified by the magnetic field. It goes through a resonance at the cyclotron frequency and becomes negative for smaller frequencies. Second, for N-photon detachment of an s-shell electron by a laser of arbitrary strength, the effect of a weak magnetic field can be described near threshold by two modulation factors, one for even N and one for odd N, which depend only on a scaled energy. Third, cyclotron resonances are shown to exist under certain conditions, as demonstrated here for the specific example of multiphoton detachment of H by a weak laser in an arbitrarily strong magnetic field.

  • Received 9 November 1989

DOI:https://doi.org/10.1103/PhysRevA.41.5039

©1990 American Physical Society

Authors & Affiliations

Bo Gao

  • Department of Physics and Astronomy, University of Nebraska, Lincoln, Nebraska 68588-0111

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Issue

Vol. 41, Iss. 9 — May 1990

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