Abstract
For the pair of /sup 238/U levels at 3868 and 26 558 cm/sup -1/, the upper-state population was measured as a function of the irradiance of a resonant exciting pulse of fixed duration. The observed damped Rabi flopping showed that the two-level system was partially coherently excited. The results were compared with the prediction of an exact solution of the time-dependent Schroedinger equation for two-level systems excited by a detuned rectangular pulse. The Schroedinger equation solution, after averaging over laser irradiance fluctuations, agrees well with the data.
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