Study of photoreaction in dichromated gelatin by laser photoacoustic technique |
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| Authors: | H Du J W Fang G J Chen T Q Cai J J Zheng |
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| Institution: | (1) Department of Physics, Zhejiang Normal University, Jinhua, Zhejiang 321004, P.R. China (Fax:+86-579-342322), CN;(2) Institute of Acoustics, Nanjing University, Nanjing 210093, P.R. China, CN;(3) Department of Chemistry, Zhejiang Normal University, Jinhua, Zhejiang 321004, P.R. China, CN |
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| Abstract: | An experimental method to study the photochemical reaction in solid-state dichromated gelatin during exposure is proposed,
in which two laser sources with different wavelengths are used to induce photoreaction and to excite photoacoustic signal,
respectively. This method is to obtain the real-time characteristics during the formation of the photoreaction product. The
curve is fitted using the Rosencwaig-Gersho (R-G) theory and chemical kinetics. The reaction order and the rate of reaction
may be obtained by fitting the parameters. The results show that photochemical reaction in dichromated gelatin conforms to
the mechanism suggested by Watanable-Westheimer, and the photosensitivity of the samples, prepared under different conditions,
is dependent on the initial concentration of photoactive ions.
Received: 18 April 1995/Revised version: 3 May 1996 |
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| Keywords: | PACS: 78 20Hp 82 80KQ 82 50 |
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