R-matrix Floquet theory of multiphoton processes. IV. Laser-assisted electron-proton scattering

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Abstract
For pt.III see ibid., vol.26, p.L275 (1993) We present the first application of the R-matrix-Floquet theory to the study of a collisional process in a laser field, namely laser-assisted electron-proton scattering. We have calculated total and angular differential cross sections for elastic scattering and processes involving a net absorption or emission of a number of photons in a linearly polarized laser field. The field induces resonances due to the temporary capture of the projectile electron into atomic hydrogen bound states, accompanied by the exchange of photons with the field. We also find structures corresponding to different sublevels due to the breaking of the spherical symmetry of the atomic system by the laser field. We analyse in detail these features and their interference patterns for various field parameters and collision geometries.