Nonresonant transitions and ionization of atoms in slow collisions in a laser field

Journal Article · Sun Jul 01 04:00:00 EDT 1979 · Sov. Phys. - JETP (Engl. Transl.); (United States)

OSTI ID:5672669

Agre, M Y; Rapoport, L P

We consider inelastic atomic collisions that take place in the field of intense electromagnetic radiation and are accompanied by absorption of nonresonant photons. The cross sections are calculated for the excitation (H(1S)+H(1S)+..omega../sub 1/..-->..H(1S)+H(2S)) and charge exchange (H(1S)+H(1S)+..omega../sub 2/..-->..H/sup +/+H/sup -/) of hydrogen atoms in close collisions. The transition cross sections turn out to depend substantially on the form of the potential curves of the quasimolecule H/sub 2/. We calculate also the two-photon ionization of hydrogen atoms irradiated by an intense laser pulse in close collisions. The cross section depends little on the form of the potential curves of the quasimolecule, and an estimate of its value shows that collision ionization makes a contribution comparable with that of direct ionization even at medium densities. In the case of remote collisions, an analytic expression is obtained for the cross section of nonresonant transitions following adiabatic turning on the field, with account taken of the Stark shift of the atomic levels.

• Research Organization: Voronezh State University
• OSTI ID: 5672669
• Journal Information: Sov. Phys. - JETP (Engl. Transl.); (United States), Journal Name: Sov. Phys. - JETP (Engl. Transl.); (United States) Vol. 50:1; ISSN SPHJA
• Country of Publication: United States
• Language: English

Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
ATOM-ATOM COLLISIONS
CHARGE EXCHANGE
COLLISIONS
CROSS SECTIONS
CRYOGENIC FLUIDS
ELECTROMAGNETIC RADIATION
ELEMENTS
ENERGY LEVELS
FLUIDS
HYDROGEN
INELASTIC SCATTERING
IONIZATION
LASER RADIATION
NONMETALS
RADIATIONS
S STATES
SCATTERING
STARK EFFECT