Cole-Filipiak Neil C, Shapero Mark, Haibach-Morris Courtney, Neumark Daniel M
Chemical Sciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States.
Department of Chemistry, University of California , Berkeley, California 94720, United States.
J Phys Chem A. 2016 Jul 14;120(27):4818-26. doi: 10.1021/acs.jpca.5b12284. Epub 2016 Feb 25.
The photodissociation dynamics of the methyl perthiyl (CH3SS) radical are investigated via molecular beam photofragment translational spectroscopy, using "soft" electron ionization to detect the radicals and their photofragments. With this new capability, we have shown that CH3SS can be generated from flash pyrolysis of dimethyl trisulfide. Utilizing this source of radicals and the advantages afforded by soft electron ionization, we have reinvestigated the photodissociation dynamics of CH3SS at 248 nm, finding CH3S + S to be the dominant dissociation channel with CH3 + SS as a minor process. These results differ from previous work reported in our laboratory in which we found CH3 + SS and CH2S + SH as the main dissociation channels. The difference in results is discussed in light of our new capabilities for characterization of radical production.
通过分子束光碎片平移光谱法研究了甲基过硫自由基（CH3SS）的光解离动力学，使用“软”电子电离来检测自由基及其光碎片。借助这种新能力，我们已证明CH3SS可由二甲基三硫化物的快速热解产生。利用这种自由基源以及软电子电离所提供的优势，我们重新研究了CH3SS在248nm处的光解离动力学，发现CH3S + S是主要的解离通道，而CH3 + SS是次要过程。这些结果与我们实验室之前报道的工作不同，在之前的工作中我们发现CH3 + SS和CH2S + SH是主要的解离通道。根据我们表征自由基产生的新能力，对结果的差异进行了讨论。
