Abstract
Abstract The oscillatory fluorescence decay for a number of rovibronic levels in the S1(nπ*) state of propynal (HCCCHO) was investigated in a supersonic jet apparatus. The quantum beats of propynal, which arise from coherent excitation of mixed S1 and T1 states, were analysed (Fourier transformed) and the intramolecular coupling (υSO = 0.3–7 MHz) determined. Calculations were performed to examine the position, the interstate coupling, and the density of vibronic T1 states in close vicinity of a given S1 state. According to these calculations vibronic spin-orbit coupling is favored over direct coupling in propynal.
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