Infrared multiple photon decomposition of CHBrF2 induced by a free-electron laser |
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| Authors: | S Kuribayashi T Tomimasu S Kawanishi S Arai |
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| Institution: | (1) Free Electron Laser Research Institute, Inc., 2-9-5 Tsuda Yamate, Hirakata, Osaka 573-01, Japan (Fax: +81-720-96-0421; E-mail: LDX02222@niftyserve.or.jp), JP;(2) Kansai Research Establishment, Japan Atomic Energy Research Institute, 25-1 Miiminami, Neyagawa, Osaka 572, Japan, JP;(3) Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606, Japan, JP |
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| Abstract: | 2 . The laser generates an intense infrared macropulse with a duration of 17 μs; the macropulse consists of a train of 380 micropulses,
each of which has a duration of a few picoseconds. The fluence of a macropulse was estimated to be about 16 Jcm-2 at a beam waist. Peak wavelengths were set in the range of 9–10 μm. The macropulse induced the IRMPD of 1 and 5 Torr CHBrF2; most of molecules in the focal region seemed to decompose at a wavelength of 9.3 μm. The mechanism is the initial decomposition
of CHBrF2 to CF2 and HBr, followed by the dimerization of CF2 to form C2F4. The decomposition was found to be isotopically selective at 9.7 μm; the final product C2F4 had a 13C atomic fraction of 6%. Th
e addition of CO2 to CHBrF2 significantly decreased the yield of C2F4. vibrationally excited CHBrF2 molecules produced by laser pulses were efficiently deactivated by CO2 molecules.
Received: 7 October 1996 |
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| Keywords: | PACS: 82 50 |
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