Born-Floquet theory of laser-assisted electron-atom collisions

Journal Article · Wed Jun 01 04:00:00 EDT 1994 · Physical Review A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.49.4852· OSTI ID:7238645

Doerr, M; Joachain, C J ^[1]; Potvliege, R M ^[2]; Vucic, S ^[3]

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1. Physique Theorique, C.P. 227, Universite Libre de Bruxelles, B-1050 Bruxelles (Belgium.) Institut de Physique Corpusculaire, Universite de Louvain, B-1348 Louvain-la-Neuve (Belgium.)
2. Department of Physics, University of Durham, Durham DH1 3LE (United Kingdom)
3. Physique Theorique, C.P. 227, Universite Libre de Bruxelles, B-1050 Bruxelles (Belgium.) Institute of Physics, P.O. Box 57, 11001 Beograd (Yugoslavia)

We present a non-Hermitian Born-Floquet theory of scattering of fast electrons by atoms in the presence of a strong monochromatic laser field. The interaction of the laser field with both the incident electron and the target atom is treated nonperturbatively, while the interaction of the incident electron with the target atom is treated in first Born approximation. Fluorescence is neglected. Detailed calculations are performed for the elastic'' scattering of 500 eV electrons by atomic hydrogen accompanied by the transfer of photons. The contribution of the entire spectrum of unperturbed atomic states to the dressing of the target is exactly taken into account by performing the calculations on a complex Sturmian basis set. In the nonresonant case, and for electric field strengths that are small with respect to the atomic unit, our Born-Floquet results are in agreement with those obtained using the semi-perturbative approach of Byron and Joachain (in which target dressing is treated in first-order perturbation theory) even at intensities where multiphoton ionization is nonperturbative. The Born-Floquet approach is particularly useful to study resonant cases, where the laser frequency matches a transition frequency in the atom. Two such situations are analyzed.

• OSTI ID: 7238645
• Journal Information: Physical Review A; (United States), Journal Name: Physical Review A; (United States) Vol. 49:6; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

664300* -- Atomic & Molecular Physics-- Collision Phenomena-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
BORN APPROXIMATION
CALCULATION METHODS
COLLISIONS
ELECTROMAGNETIC FIELDS
ELECTROMAGNETIC RADIATION
ELECTRON COLLISIONS
ELECTRON-ATOM COLLISIONS
ELEMENTS
ENERGY RANGE
EV RANGE
EV RANGE 100-1000
FLOQUET FUNCTION
FUNCTIONS
HYDROGEN
LASER RADIATION
NONMETALS
RADIATIONS
SCATTERING