Two-photon emission from heavy elements with a single K-shell vacancy (e.g., Cu⁺) is considered. Simple closed-form expressions are given for the spontaneous, singly stimulated, and doubly stimulated two-photon emission rates. The material parameters relevant to these two-photon processes are shown to be the one-photon absorption cross sections and oscillator strengths.
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Isaac Freund (1973) studied this question.
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