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Journal of Physics B Atomic Molecular and Optical Physics

Electron energy spectrum after multiphoton ionisation

Michele Crance

Published Jun 14, 1988• 8 citations
Publisher

Abstract

For electrons emitted in multiphoton ionisation, the author discusses the relation between the initial energy of the electron and its energy when it has left the light beam. The author focuses on the situation where the pulse duration is of the order of the time it takes for the electron to leave the light beam. The author shows that the position and the width of a peak in the electron energy spectrum depend strongly on the ratio between the maximum intensity and the saturation intensity.

DOI
10.1088/0953-4075/21/11/014

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For electrons emitted in multiphoton ionisation, the author discusses the relation between the initial energy of the electron and its energy when it has left the light beam. The author focuses on the situation where the pulse duration is of the order of the time it takes for the electron to leave the light beam. The author shows that the position and the width of a peak in the electron energy spectrum depend strongly on the ratio between the maximum intensity and the saturation intensity.
Previous results for the shift of the ionisation potential of an atom in a laser field are used to investigate the kinematics of multiphoton ionisation in either a laser beam or a laser pulse. Previous results for a laser beam show essentially no shifts of the 'above-threshold ionisation' peaks in the electron energy distribution and only small widths. Results for a laser pulse show the possibility of large shifts and widths growing as the pulse becomes shorter. Electrons which absorb a larger number of photons are predicted to show less shifted and narrower peaks.
In a recent experiment involving multiphoton ionisation of Xe it was found that the photoelectron spectrum contained peaks which corresponded to absorption of more than the minimum number of photons required ionise. The effective orders of nonlinearity, furthermore, showed a striking uniformity. The authors investigated these effects with a model approximation consisting of a single bound state and m continua. Simple analytic expressions are obtained for the quantity measured in the experiment and the limit m to infinity is obtained. The results show good qualitative agreement with experiment.