Single vibronic level photochemistry of formaldehydes in the ? 1A2 state: Radiative and nonradiative processes in H2CO, HDCO, and D2CO

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Abstract
Details of experimental data on the fluorescence quantum yields and fluorescence decay times of H2CO, HDCO, and D2CO are given for various single vibronic level (SVL) photoexcitations. These values were also measured at various pressures in order to obtain the ’’isolated’’ molecule values and the collisional relaxation data. Highly structured variation of the SVL radiative lifetimes (τR) and the SVL nonradiative lifetimes (τNR) observed in H2CO in particular shows that the out‐of‐plane bending mode (ν4) is the ’’inducing’’ mode for the radiative transitions and also the ’’promoting’’ mode for the nonradiative transitions. A test of the radiative and the radiationless theory of Fleming, Gijzeman, and Lin shows qualitative agreement with the experimental data presented herein.