Quenching processes in electronically excited sulfur dioxide generated by chemical reaction
Quenching processes in electronically excited sulfur dioxide generated by chemical reaction
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DOI：
10.1021/j100406a009
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发表时间：
1986-07
期刊：
影响因子：
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通讯作者：
R. J. Glinski;D. Dixon
中科院分区：
文献类型：
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作者：
R. J. Glinski;D. Dixon
SO/sub 2/的发光进行了研究，作为分子形成在稳态反应的臭氧与甲基溴和二甲基二硫醚。电子激发态SO/sub 2/的大部分是在基元反应SO + O/sub 3/中产生的。用化学计时法研究了SO/sub 2/* 的猝灭。观察到惰性气体压力的增加对荧光和磷光的影响。通过使用一个目前公认的荧光物理模型SO/sub 2/，荧光猝灭允许光谱无法分辨的长寿命和短寿命的荧光单态被区分。在SO与O/sub 3/的基元反应中没有观察到产生磷光的/sup 3/B/sub 1/态。这也是很难解释的形成/sup 3/B/sub 1/状态的碰撞诱导的系统间交叉从单重态之一。相反，提出了在冲突时产生/sup 3/B/sub 1/状态的未指定中间状态的参与。的物理效应和参与的未指定的国家建议是类似的其他工人所讨论的。
Luminescence from SO/sub 2/ was studied as the molecule was formed in the steady-state reactions of ozone with methyl mercaptan and with dimethyl disulfide. The bulk of the electronically excited SO/sub 2/ was generated in the elementary reaction SO + O/sub 3/. A chemical timing method was used to analyze the quenching of SO/sub 2/*. Effects of increasing noble gas pressure on the fluorescence and phosphorescence were observed. By use of a presently accepted photophysical model for SO/sub 2/, the quenching of the fluorescence allowed the spectroscopically unresolvable long-lived and short-lived fluorescent singlet states to be distinguished. The /sup 3/B/sub 1/ state that yields the phosphorescence was not observed to be created in the elementary reaction of SO with O/sub 3/. It was also difficult to account for the formation of the /sup 3/B/sub 1/ state by a collisionally induced intersystem crossing from one of the singlet states. Instead, the participation of an unspecified intermediate state producing the /sup 3/B/sub 1/ state on collision is proposed. The photophysical effect and the participation of the unspecified state are suggested to be similar to those discussed by other workers.