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• W2055698710 abstract "The yields, lifetimes and spectra of singlet 1Au (S1) and triplet 3Au (T1) emissions from glyoxal vapor (0.003 to 10 torr) have been measured after initially pumping levels about 1000 cm−1 above the S1 zero-point level with the 4358 A Hg line and with flash excitation centered at 4345 A. Only S1 emission is observed at the lowest pressures. The singlet fluorescence contains appreciable structure from the zero-point level even when the hard sphere collision interval exceeds the radiative lifetime calculated from the absorption coefficient. Implications of long lifetimes (due to S1 - T1 vibronic interactions) are not confirmed by pulsed excitation studies. Both S1 and T1 emissions are observed at pressures above about 0.1 tert and both are self-quenched. However, added gases such as cyclohexane, argon, and helium selectively quench only S1 emission. This quenching is collision-induced S1→T1 intersystem crossing with cross sections of order 0.1 hard sphere for transitions from the S1 zero-point level. The triplet yield in 0.2 torr of pure glyoxal is probably near unity, and the subsequent crossing T1 → S0, if it occurs, lies in the statistical limit. Indications of fast nonradiative decay from high triplet vibrational levels are seen in the phosphorescence yields. Self-quenching of the triplet state appears to be associated with the photochemical activity of glyoxal." @default.
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• W2055698710 date "1973-08-01" @default.
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• W2055698710 title "Collision induced intersystem crossing the photophysics of glyoxal vapor excited at 4358 Å" @default.
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• W2055698710 doi "https://doi.org/10.1016/0301-0104(73)87001-6" @default.
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