The authors derive equations describing the non-resonant multiphoton ionisation of atoms or electron scattering in the presence of a strong laser field. They include both pure diagonal and off-diagonal coupling of continuum states. Their equations, in certain limits, reduce to the ones previously studied. They present some numerical results concerning angular distributions of photoelectrons in above-threshold ionisation and energy spectra in electron scattering.
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Grochmalicki et al. (1986) studied this question.
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