Coulomb-gauge electrodynamics analysis of two-photon exchange in electron-atom scattering. II. Interaction at all distances beyond atomic dimensions

Journal Article · Fri Jul 01 04:00:00 EDT 1988 · Phys. Rev. A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.38.7· OSTI ID:7058810

Au, C K

We follow up on our previous analysis of the two-photon exchange potential in the scattering of a light point-charged particle by a neutral system (electron-atom scattering) by examining all the time-ordered Feynman diagrams involved. In a close parallel with the work of J. F. Babb and L. Spruch (Phys. Rev. A 36, 456 (1987)) on Rydberg states of helium, the present analysis on scattering is valid for all distances larger than the atomic radius (R>a). In the dipole approximation, we reproduce the potential obtained by G. Feinberg and J. Sucher (Phys. Rev. A 27, 1958 (1983)) using a more powerful covariant field-dispersion-theory technique. We give simple expressions for the additional nonadiabatic and multipole corrections in the two-Coulomb-photon exchange channel and also give the lowest nonadiabatic and energy-dependent corrections to the retardation potentials. These potentials are valid for all R>a. The implication of these additional correction potentials in the study of heliumlike Rydberg states is briefly discussed.

• Research Organization: Department of Physics and Astronomy, University of South Carolina, Columbia, South Carolina 29208
• OSTI ID: 7058810
• Journal Information: Phys. Rev. A; (United States), Journal Name: Phys. Rev. A; (United States) Vol. 38:1; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
CASIMIR EFFECT
COLLISIONS
DIAGRAMS
ELECTRODYNAMICS
ELECTRON COLLISIONS
ELECTRON-ATOM COLLISIONS
ENERGY LEVELS
EXCHANGE INTERACTIONS
EXCITED STATES
FEYNMAN DIAGRAM
INTERACTIONS
POTENTIALS
RYDBERG STATES