Laser-modified angular distribution of Compton electrons

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Abstract
Calculations of the triple differential cross section (TDCS) of the laser-assisted Compton effect in hydrogen-like atoms are reported. The theoretical model is a generalisation of the field-free exact treatment given years ago by Eisenberger and Platzman (1970), without resorting to the impulse approximation. The laser field is taken in the dipole approximation, homogeneous and single mode. The incident and the outgoing X-ray photon energy are taken to be 20 and 19.95 keV, respectively, and the X-ray photon scattering angle is taken as 5 degrees . The laser electric field is considered to be much smaller than the characteristic intra-atomic field, while the laser frequency is off-resonant with any pair of levels of the target atom. Significant changes in the shape of the TDCS are found when laser photons are exchanged. The origin of the modifications to the TDCs is discussed in detail. The considerations given here for modifications of the Compton electron angular distribution also largely hold true for other laser-assisted processes, such as, for instance, the X-ray photoeffect and electron-atom ionisation.

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