Time-resolved ``two color'' photoluminescence is reported from the 944 meV band produced by a low concentration of copper in silicon. Photoluminescence has been generated by a pulsed pump beam, and then partially quenched by a probe beam from a free-electron laser. The kinetics of the quenching allow the absorption cross section for photoionization of the center to be determined without knowing its concentration in the sample. The time-resolved data demonstrate a partial recovery of the luminescence after photoionization, due to repopulation of the ionized traps.
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Vinh et al. (2005) studied this question.
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