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Journal of Physics B Atomic Molecular and Optical Physics

Resonance fluorescence induced autoionization

Sami Heinäsmäki, Teijo Åberg

Published Apr 14, 1998• 0 citations
Publisher

Abstract

We use multichannel resonant scattering theory for an extension of the conventional theory of autoionization resonances in photoabsorption. It incorporates autoionization induced by resonance fluorescence. As a result we obtain a modified Fano profile formula. The result shows that the new mechanism has in certain cases a strong influence on the shape of the resonances.

DOI
10.1088/0953-4075/31/7/015

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We use multichannel resonant scattering theory for an extension of the conventional theory of autoionization resonances in photoabsorption. It incorporates autoionization induced by resonance fluorescence. As a result we obtain a modified Fano profile formula. The result shows that the new mechanism has in certain cases a strong influence on the shape of the resonances.
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We report the first observation of significant perturbations by external fields of the autoionizing resonance structure of a two-electron atoms. The effects of electric fields up to 20 kV/cm on autoionizing resonances in Sri were observed by three-photon ionization spectroscopy in an atomic beam. In addition to effects analogous to those for bound Stark states of a one-electron Rydberg atom, we observed a new effect: The characteristic shapes and widths of autoionizing resonances (Fano-Beutler profiles) can be strongly influenced by electric fields.
Expressions for magneto-optical rotation in an isolated autoionising resonance embedded in a flat continuum are obtained by applying the Kramers-Kronig relations to the Fano profile formula for photoabsorption. By considering rotation per unit optical depth in a Beutler-Fano profile, optimum conditions for detecting the rotation are deduced, and are shown to depend on both the width and the shape index. The far-wing approximation turns out to be inapplicable in the presence of a continuum background, but large rotation can occur in the transmission window of a narrow resonance of low q.
In the present work it is shown that in atomic photoionization the Fano-like behaviour of vector correlation parameters in the region of an isolated autoionizing resonance possesses two universal values: the width and the energy shift with respect to the energy of the autoionizing state. This property is confirmed by fluorescence polarimetry studies, which provide, in the particular case of Xe 4d−15/26p (J = 1) photoexcitation, the experimental determination of the alignment and the orientation of the final photoion across the resonance. 1.