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Strontium vapour was irradiated by a dye laser tuned near the 460.73 nm (1P10-1S0) resonance transition. Collision-induced fluorescence at the resonance frequency and Rayleigh scattering at the laser frequency were studied as a function of detuning Delta over a range of about 30 nm (1500 cm-1). The Rayleigh component was found to vary as Delta -2, as expected, whereas the collision-induced fluorescence was markedly asymmetric. This experiment constitutes a direct measurement of the redistribution function.
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Carlsten et al. (1976) studied this question.
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