Schenzle, Wong, and Brewer have recently proposed a theorem [Phys. Rev. A 22, 635 (1980)] which states that the coherent transient signals produced in an optically thin gaseous sample of atoms are limited to a certain time interval after the excitation process which produces them. We comment on the range of validity of this theorem.
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Mossberg et al. (1981) studied this question.
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