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VOLUME 45 (1987) | ISSUE 6 | PAGE 309
Nutation caused by a change in relaxation rate
Coherent oscillations in the populations of the levels of a quantum system (a nutation) are known to arise as a transient process when an interaction with a nearly resonant alternating field is turned on abruptly [see, for example, J. Macomber, Dynamics of Spectroscopic Transitions (Russ. transl. Mir, Moscow, 1979) ]. In this letter we report an observation of nutation in an alternating field of fixed amplitude and frequency. The nutation arises when the relaxation time in the system is suddenly increased.