Abstract
Zeeman quantum beats, magnetic depolarization (the so-called Hanle effect) and magnetic quanching are observed in fluorescence of pyrimidine vapor on excitation into S 1 and interpreted in terms of singlet-triplet interaction between a zero-order singlet state of S 1 which carries the absorption intensity from the ground electronic state and zero-order triplet states located near S 1. Fluorescence depolarization at zero field is attributed to an internal magnetic field resulting from the hyperfine interaction at the excited singlet-triplet mixed level, and the hyperfine quantum beats are clearly observed on excitation at the R(0) line of the 0-0 band of pyrimidine- d 4.
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