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Callear和Dickson曾研究过CH_3SSCH_3在195nm的闪光光解,指出S—S键和C—S键同时断裂,并认为光子的过剩能量在光解碎片中是按统计模型分配的。由于CH_3SSCH_3光解在光化学和环境化学中的重要性,S—S键在生物化学中也有重要的地位,我们用分子束激光裂解碎片的平动能谱仪,研究了CH_3SSCH_3在248nm的光裂解,得到光解碎片的平动能分布。结果表明,S—S键的断裂不符合统计模型。实验装置如前所进。CH_3SSCH_3(Merck Co.)蒸气(～30Torr)在室温下由空气载带,经喷嘴直径0.5mm的脉冲阀,以频率80Hz喷入源室。形成的超声分子束准直后的全
Callear and Dickson have studied the flash photolysis of CH_3SSCH_3 at 195 nm, pointing out that the S-S and C-S bonds are simultaneously cleaved and that the excess energy of the photons is distributed in the photolysis fragment as a statistical model. Due to the importance of photolysis and environmental chemistry of CH_3SSCH_3, the S-S bond also plays an important role in biochemistry. By using a kinetic spectrometer with molecular beam laser pyrolysis fragmentation, the photolysis of CH_3SSCH_3 at 248 nm was studied. Photodynamic decomposition of the translational motion energy distribution. The results show that the S-S bond does not fit the statistical model. The experimental setup is as before. CH_3SSCH_3 (Merck Co.) Vapors (~ 30 Torr) were air-borne at room temperature and injected into the source chamber at a frequency of 80 Hz via a pulsed valve with a nozzle diameter of 0.5 mm. The formed ultrasonic molecular beam is collimated after the whole