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• W2024991742 abstract "The intensity of fluorescence of the first excited singlet sulphur dioxide molecule (1SO2) shows an unexpected non-exponential decay when observed over several lifetimes. This is found for both broad-band, Xe-flash excitation at 2660 ± 100 and 2860 ± 160 Å and for laser excitation at 2662 ± 1 Å. The decay is exponential when either long wavelength, broad-band excitation is employed (2980 ± 140 Å) or at long observation times using any excitation wavelength. All of the data are most consistent with the hypothesis of one emitting singlet state whose rate constants are somewhat dependent on its degree of vibrational excitation. A kinetic treatment of the data gives the zero pressure lifetime and the quenching rate constants for the vibrationally rich (22.7 kcal/mole) and the vibrationally relaxed excited singlet states. These and other quantum yield data suggest that the observed decrease in the lifetime of the 1SO2 state which accompanies vibrational relaxation is associated with a significant increase in the rate of some ill-defined, non-radiative decay process for these conditions. Emission data from the spectroscopically analogous compound NO2, excited at 4365, 5324, and 6943 Å, also show non-exponential decay. In this case, however, the lifetimes at zero pressure show no significant variation with alteration in the degree of vibrational excitation of the NO2 (2B1) state." @default.
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• W2024991742 date "1972-03-01" @default.
• W2024991742 modified "2023-09-23" @default.
• W2024991742 title "Vibronic effects in the decay of the fluorescence excited in SO2 and NO2" @default.
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• W2024991742 doi "https://doi.org/10.1016/0009-2614(72)80096-4" @default.
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