Ponderomotive force and AC Stark shift in multiphoton ionisation

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, , Citation H G Muller et al 1983 J. Phys. B: Atom. Mol. Phys. 16 L679 DOI 10.1088/0022-3700/16/22/001

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1 FOM-Inst. for Atomic & Molecular Phys., Amsterdam, Netherlands

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0022-3700/16/22/L679

Abstract

A non-perturbative approach to the photoionisation of a model atom in arbitrarily strong fields is described. An explanation is given for the disappearance of the lowest energy electrons in a multiphoton ionisation experiment at very high intensities, in terms of the AC Stark shift of the ionisation potential of the atom, followed by ponderomotive acceleration of the photoelectrons.

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