Photoacoustic study of 280nm band of acetone vapor.
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概要
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Relaxation of the energy absorbed by acetone vapor (200 Torr) on excitation with UV (230–340 nm) was investigated by the photoacoustic technique. The presence of two relaxation paths was found by their difference in heat production rates: The faster path is S<SUB>0</SUB>→S<SUB>1</SUB>→T<SUB>1</SUB>→S<SUB>0</SUB> and the slower path is S<SUB>0</SUB>→radicals→recombination products. The PA spectra corresponding to these paths were determined separately. The spectrum for the T<SUB>1</SUB> path has a peak around 295 nm and extends to longer wavelengths beyond 310 nm. The spectrum for the decomposition path has a peak around 275 nm and overlaps with the spectrum for the T<SUB>1</SUB> path in the region of λ<310 nm. The study of frequency dependences of PA signals showed the presence of faster and slower heat releasing steps in each path. In the T<SUB>1</SUB> path, the faster and the slower steps are due to vibrational deactivation of hot T<SUB>1</SUB> formed from S<SUB>1</SUB> and of hot S<SUB>0</SUB> formed from T<SUB>1</SUB> respectively. In the radical path, the faster and slower steps are the deactivation of the hot radicals and the recombination of the thermalized radicals respectively. The addition of O<SUB>2</SUB> to the system accelerated the heat release process via the relaxed T<SUB>1</SUB> and also converted the slow heat release process of recombination into a fast process of addition reactions of O<SUB>2</SUB> to the radicals.
- 公益社団法人 日本化学会の論文
著者
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Morohashi Makoto
Department Of Electronics Faculty Of Engineering Nagoya University
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Oka Takefumi
Department of Applied Physics, Tokyo Institute of Technology
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Oka Takefumi
Department of Electrical Engineering, Nagaoka Technical College
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Kobayashi Humiyo
Department of Electrical Engineering, Nagaoka Technical College
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Oguma Naoki
Department of Electrical Engineering, Nagaoka Technical College
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