Two quantum-beat phenomena observed for magnetically tuned atomic sublevels
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Quantum-beat signals can also be observed when the length of the exciting pulse is not short compared to the Bohr precession period if spontaneous decays during the pulse are important. Experimental demonstration for Zeeman quantum beats in the 6s6p 3P1-6s21S0 ytterbium transition, as well as a simple description of the phenomenon is given. In the same way as quantum beats can be obtained for coherently excited Zeeman sublevels close to the zero-field level crossing, beats can be induced close to a high-field level crossing. We have observed such high-field quantum beats for the 7 2P state of 133Cs.