Abstract
We measure the fluorescence decays for low-lying rotational states in the first eight vibrational levels of HCO B̃ 2A′. Some long-lived decays exhibit weak quantum beats that we attribute to a higher-order hyperfine perturbation in the B̃ state. We estimate fluorescence quantum yields by combining measured fluorescence intensities and a calculated electronic transition moment. The estimated nonradiative decay rates increase with increasing vibrational excitation and exhibit mode specificity. We discuss possible vibronic coupling mechanisms, including spin-orbit coupling to quartet states and predissociation via the A ̃ 2 Π( 2 A″) and X̃ 2A′ states.
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