Cooling of a three-level system resulting from anti-Stokes scattering of electromagnetic radiation has been observed for the first time. A CO₂ laser was used to lower the temperature of samples of CO₂ and CO₂-Xe mixtures. Satisfactory agreement between theory and experiment was found. The technique's ability to deliver an extremely fast cooling pulse should find application in the study of nucleation dynamics.
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Djeu et al. (1981) studied this question.
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