Abstract
Lifetimes of fluorescence from various vibrational levels in the 1B 1 (nπ *) state or pyrimidine vapor indicate that S 1 → S o intcrnal conversion is not important non-radiative decay channel of molecules with low exccss vibrational energies. The dominant “optical” accepting mode tor the 1nπ * → 3ππ * intersystem crossing is the totally symmetric ring stretching mode xxx.
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