Rotational dependence of the fluorescence quantum yields of H2CO and D2CO (? 1A2): single rovibronic level values and their average values for the 41 level

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Abstract
The fluorescence quantum yields, ΦF(K′, J′), of single rovibronic levels (SRVL’s) of the 41 (i.e., ν4′=1) vibrational state of H2CO and D2CO (? 1A2) have been measured at low pressures by laser‐induced fluorescence using a multiple path cell. From these data, the ’’absorption intensity weighted’’ averages of ΦF are obtained for several K′ rotational manifolds as <ΦF(K′) 〉 and for the 41 level as 〈ΦF〉. The latter value of 0.031 confirms the validity of the SVL value of 0.0344 obtained from broad‐band optical excitation by Miller and Lee. A random variation of ΦF (K′, J′) with J′ is observed, and its implication to the question of radiationless transitions in formaldehyde molecules is discussed.