Two-photon absorption resonance in the presence of transit effects

Abstract

The impulse approximation for capture of atomic K-shell electrons by incident protons is investigated with respect to a realistic treatment of the initial and intermediate states of the atomic target. Explicit evaluations are made in the single-electron picture described by an effective target potential of Yukawa type. When compared with corresponding results within the standard hydrogenic description, it is found that the effect of proper screening is similar to the effect of off-shell factors found in the strong-potential Born approximation. Effort should therefore be directed towards a study of the combined effect in order to obtain a more complete understanding of the electron capture process.

Deflection of an atomic beam by a laser wave: transition between diffractive and diffusive regimes

“…Actually, equations (2.13) are written in a 'rotating frame' representation, which eliminates any explicit time dependence in exp( jziwt). By Fourier transform with respect to U, equations (2.13) become the GOBE in the Wigner representation (Vorobev et a1 1969, Baklanov and Dubetskii 1976, Javanainen and Stenholm 1980, Cook 1980a, Letokhov and Minogin 1981. Since the operator -iha/au is changed into p in such a transformation, the left-hand side of equations (2.13) becomes the 'hydrodynamic derivative' a/at + ( p / M ) .alar.…”

Fokker-Planck analysis of atomic beam cooling by frequency chirp methods

“…The control of the atomic motion by photon scattering is limited by momentum fluctuations due to the stochastic recoil of the fluorescence photons. Several studies have analysed these fluctuations by means of a Fokker-Planck equation (Baklanov and Dubetskii 1976, Cook 1980a, b, Minogin 1980a, Stenholm 1983); the statistical nature of the motion is represented by diffusion terms in addition to the mean radiation forces.…”