Laser induced fluorescence of the HgH and HgD A1 2Π1/2 state in the supersonic free jet

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Abstract
The fluorescence excitation spectra and lifetimes of the HgH and HgD A1 2Π1/2 are obtained in the supersonic free jet. The rotational temperature of the ground state HgH and HgD radicals is cooled down to about 10 K in the free jet. The Morse potential parameters of the HgH and HgD A1 2Π1/2 states are determined. The fluorescence lifetimes of the A1 state are obtained to be 101 (v′=0) and 41 ns (v′=1) for HgH, and 131 (v′=0), 127 (v′=1), and 126 ns (v′=2) for HgD. The isotope effect of the fluorescence lifetimes is explained by the weak predissociation to the ground state atoms caused by the tunneling effect through the left‐hand limb of the potential curves.