Rotational effects on fluorescence yields and decays from the lower vibronic levels of the S1 state of s-triazine vapor

Nobuhiro Ohta*, Hiroaki Baba

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15 引文 斯高帕斯(Scopus)

摘要

Fluorescence quantum yields and decays of s-triazine vapor have been measured at different excitation positions along the rotational contours of the 601 and 602 absorption bands and at different pressures (40 mTorr-200 Torr). The characteristics of the fast fluorescence component are roughly independent of the rotational level excited, while those of the slow component show a marked rotational level dependence. The slow fluorescence quantum yield gives a sharp peak near the band origin, where the corresponding lifetime exhibits a distinct minimum. These results are related to the observation that the density (or number) of triplet levels coupled to the optically prepared singlet level increases with increasing total rotational angular momentum quantum number, J′. The slow component is efficiently quenched by long-range collisions, indicating that as a result of collision-induced relaxation the molecule is transferred from the S-T mixed rovibronic level mainly to the pure triplet rovibronic manifold.

原文English
頁(從 - 到)41-56
頁數16
期刊Chemical Physics
82
發行號1-2
DOIs
出版狀態Published - 1 12月 1983

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