Quantum jumps due solely to spontaneous Raman scattering between the Zeeman sublevels of a single ²⁴Mg⁺ ion have been observed in the fluorescence emitted by the ion. A theory of quantum jumps for this system predicts that coherences between excited levels cause the ratio of the mean duration of the "fluorescence-on periods" to the mean duration of the "fluorescence-off periods" to be independent of laser intensity. The measured value agrees with the predicted one to within the measurement precision of 2%. The distribution of the durations of the off periods also agrees with theory.
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Hulet et al. (1988) studied this question.
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