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We detect the radiatively driven electric quadrupole transition to the metastable ^2D₅₂ state in a single, laser-cooled Hg II ion by monitoring the abrupt cessation of the fluorescence signal from the laser-excited ^2S₁₂^2P₁₂ first resonance line. When the ion "jumps" back from the metastable D state to the ground S state, the S resonance fluorescence signal immediately returns. The statistical properties of the quantum jumps are investigated; for example, photon antibunching in the emission from the D state is observed with 100% efficiency.
Bergquist et al. (Mon,) studied this question.