Fluorescence, Phosphorescence, and Triplet Formation in Biacetyl at Low Pressures
Fluorescence, Phosphorescence, and Triplet Formation in Biacetyl at Low Pressures
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低压下联乙酰的荧光、磷光和三重态形成
DOI：
10.1063/1.1672210
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发表时间：
1969
影响因子：
4.4
通讯作者：
H. M. Poland
中科院分区：
文献类型：
--
作者：
C. Parmenter;H. M. Poland
联乙酰蒸气中的 S1 → T 系间穿越已通过直接观察初始态和最终态的发射进行了检查。当联乙酰通过吸收 4358-A 辐射而被激发时，单线态和三线态发射产率与 40-0.1 托范围内的压力无关。由于在该范围的下限内建立了单线态弛豫的孤立分子条件，因此在不存在涉及激发单线态的碰撞扰动的情况下，联乙酰中必须发生三线态形成。在压力降至 0.03 托时，仍可观察到三重态发射，但由于壁上的三重态失活，发射产量降低。结果在最近的无辐射跃迁理论框架内进行了讨论。
The S1 → T intersystem crossing in biacetyl vapor has been examined by direct observation of emission from both the initial and final states. When biacetyl is excited by absorption of 4358‐A radiation, both the singlet‐ and the triplet‐emission yields are independent of pressure in the range 40–0.1 torr. Since isolated molecule conditions are established for singlet relaxation in the lower limit of this range, triplet formation must occur in biacetyl in the absence of collisional perturbations involving the excited singlet state. Triplet emission continues to be observable at pressures descending to 0.03 torr, but the emission yield decreases due to triplet deactivation at the walls. The results are discussed within the framework of recent theories of radiationless transitions.