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The characteristics of the lowest 1 P autoionizing states of the Sr atom, which are excited by a weak electromagnetic field, and also the parameters, which determine the electronic and radiative decay (harmonic generation) of these states under multistep laser excitation through the intermediate discrete states 5s5d 1 D and 5p 2 1 D, are determined. The line profiles of the resonances in the ejected photon and electron spectra are obtained. The calculation is carried out in the diagonalization approximation, the state classification is based on the LS-coupling scheme and the coupling of photon and electron decay channels is allowed for. The theoretical results agree with the experimental data on the excitation of the 1 P autoionizing states obtained using linear and non-linear optics.
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Danzan et al. (1990) studied this question.
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