A symmetric deflection of a Na beam by resonant standing-wave radiation has been observed. The combination of absorption and stimulated emission of the two oppositely traveling waves ω₊ and ω_- results in a net deflection of the beam. The observed magnitude of the beam deflection and its dependence on the radiation power agree with a calculation based on the random-walk picture that the two traveling waves ω₊ and ω_- are utilized randomly in the stimulated-emission and absorption processes.
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Arimondo et al. (1979) studied this question.
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