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Physica Scripta

Threshold Phenomena in Strong-Field Photoionization and Photodetachment

Jarosław Zaremba

Published Jan 1, 1992• 1 citation
Publisher

Abstract

A review is given of investigations of near-theshold photoionization and photodetachment. The non-pertubative models of these processes in different physical situations are presented. In particular, dynamics of the ground state population and properties of the photoelectron spectra are analyzed. Possibilities of the experimental verification of the predicted result are briefly discussed.

DOI
10.1088/0031-8949/1992/t40/010

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A review is given of investigations of near-theshold photoionization and photodetachment. The non-pertubative models of these processes in different physical situations are presented. In particular, dynamics of the ground state population and properties of the photoelectron spectra are analyzed. Possibilities of the experimental verification of the predicted result are briefly discussed.
Near-threshold single-photon photodetachment processes are considered for simple model systems representing negative ions exposed to monochromatic radiation. The model systems considered feature an initial discrete state, the photoelectron continuum, and in some cases an excited or autodetaching discrete state. Population trapping through the formation of a bound dressed state and the photoelectron spectra are examined. Two photoelectron spectra are defined : a primary spectrum which results from decay while the laser interaction is on and a secondary spectrum which results from the destabilization of the bound dressed state if the interaction is turned off again. Careful attention is given to the passage of the poles of the Green's operator through the low-energy boundary of a continuum, and it is concluded that such poles move nonmonotonically through the boundary of an s-wave continuum, but monotonically through the boundary of a p-wave or higher-l-wave continuum. Two example systems, one featuring a single discrete state and an s-wave continuum and one featuring two discrete states and a p-wave continuum, are considered in detail.