Vibrational and electronic energy transfers from a single vibronic level of H2CO (?, 1A2), the 41 level

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Abstract
The vibrational deactivation rates from the 41 level to the 40 level of H2CO (?, 1A2) and the electronic quenching rates of H2CO (?,41;40) have been measured for various foreign gases; acetaldehyde, acetone, n‐butane, CH2F2, NO, CO, N2, O2, and Ar including H2CO itself. Single vibronic level emission spectroscopy of laser induced fluorescence from H2CO indicates that the collisional vibrational energy removal of 125 cm−1 is quite efficient for all of the collision partners, but O2 is abnormally less efficient. The collisional electronic quenching has been measured by the pressure dependence of the overall fluorescence emission yield, and it is shown to be inefficient in general. Hard sphere collision efficiency of the self‐quenching by H2CO(?), ∼0.05, is higher than the collisional efficiencies of the π‐bonded foreign gases, ∼0.02 for NO and ∼0.005 for O2, CH3CHO and (CH3)2CO. Probable explanations for the measured rates are given, especially to account for the observed anomalies.

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