13C-selective IRMPD of CBr2F2/Cl2 and CCl2F2/Br2 systems |
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Authors: | Peihua MA Kyoko SUGITA Shigeyoshi ARAI |
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Institution: | (1) Qinghai Institute of Saline Lakes, Chinese Academy of Science, Xining, China;(2) The Institute of Physical and Chemical Research, Wako-shi, 351-01 Saitama, Japan;(3) Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, 606 Kyoto, Japan |
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Abstract: | The CO2 TEA laser irradiation of CBr2F2 in the presence of Cl2 yielded 13C-enriched CBrClF2 and 13C-enriched CCl2F2 under selected experimental conditions. As the photolysis proceeded, the 13C concentration of CBrClF2 decreased gradually and that of CCl2F2 increased up to 90% or higher. These results can be explained by the mechanism involving the secondary 13C-selective IRMPD of the primary product CBrClF2. On the other hand, the carbon-containing product for a CCl2F2/Br2 system was only CBrClF2; the further IRMPD of which probably regenerated CBrClF2 in the presence of Br2. The decomposition probabilities of 12C- and 13C-containing molecules in both systems were measured as functions of laser line, laser fluence, and reactant pressures. |
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Keywords: | 82 50 33 |
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