Multiphoton detachment in a static uniform magnetic field

Journal Article · Tue May 01 04:00:00 EDT 1990 · Physical Review, A (General Physics); (USA)

DOI:https://doi.org/10.1103/PhysRevA.41.5039· OSTI ID:6941589

Gao, B ^[1]

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1. Department of Physics, University of Nebraska, Lincoln, Nebraska 68588-0111 (USA) Department of Astronomy, University of Nebraska, Lincoln, Nebraska 68588-0111 (USA)

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 {ital N}-photon detachment of an {ital 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 {ital N} and one for odd {ital 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{sup {minus}} by a weak laser in an arbitrarily strong magnetic field.

• OSTI ID: 6941589
• Journal Information: Physical Review, A (General Physics); (USA), Journal Name: Physical Review, A (General Physics); (USA) Vol. 41:9; ISSN PLRAA; ISSN 0556-2791
• Country of Publication: United States
• Language: English

Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ANIONS
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
ELECTROMAGNETIC RADIATION
ELECTRON DETACHMENT
HYDROGEN IONS
HYDROGEN IONS 1 MINUS
ION COLLISIONS
IONS
LASER RADIATION
MAGNETIC FIELDS
MULTI-PHOTON PROCESSES
PHOTON COLLISIONS
PHOTON-ION COLLISIONS
RADIATIONS
TESTING
VALIDATION