Abstract
The ionization of atomic hydrogen by protons in the presence of alaser background is studied. We describe the initial and finalstates of the proton by plane waves, the state of the target by adressed wavefunction obtained by time-dependent theory in the soft-photon approximation, and the state of the ejected electron bya two-centre Coulomb function modulated in time by the laserfield in the same way as a plane wave. The laser-modified doubledifferential cross sections for a geometry of laser polarizationparallel to the incident cross section of the proton are calculatedand compared with the laser-free results. For each small electronejection angle, a critical point is found in the electronenergy spectrum, behind which the cross section is notablyenhanced.
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