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Journal of Physics B Atomic and Molecular Physics

Population trapping in photoionisation to dressed continuum states

Piers Coleman, P. L. Knight

Published Apr 14, 1982• 105 citations
Publisher

Abstract

Continuum states in photoionisation may be dressed by laser coupling to bound states. The authors show that the photoexcitation of such dressed continuum states can lead to the trapping of part of the population in a coherent superposition state and the diminution of total ion yields.
DOI
10.1088/0022-3700/15/7/002

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The author predicts that bound atomic or molecular states can be dressed by an applied field in a fashion analogous to the pseudo-autoionising structure induced in a photoionising continuum. Just as the continuum structure can enhance the photoionisation rate, the induced virtual structure between real states can be used to enhance multiphoton processes by tuning one of the intermediate fields near this virtual resonance. The author concentrates on stimulated Raman scattering, but the connection to multiphoton absorption is pointed out.
An exactly soluble model is used to describe transitions, induced by two strong laser beams, proceeding from the initial discrete state to the continuum via two channels. In the first channel the transition occurs via an intermediate, near-resonant discrete state located close to the continuum edge. In the second channel the intermediate state belongs to the continuum. Population trapping occurs due to an interference between the two channels. The model can be used to describe the photodetachment of electrons from negative ions or the photodissociation of molecules.
The effects of saturation of a bound-bound atomic resonance on bound-continuum decays in investigated using the dressed state concept. Two special cases are discussed: the modification of spontaneous radiative decay by coupling to a third bound atomic state, and the changes in single-photon photoionisation when the initial discrete state is coupled by an external field to another bound state. For strong external fields Rabi oscillations and dynamic Stark splittings profoundly alter the 'decay'; but for weak fields the alterations at line centre are no less dramatic.