Mass spectrometric study of photo dissociation of organic molecules by vacuum-ultraviolet irradiation for development of analysis technique |
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Authors: | M. Wasamoto M. Kaku A. Yokotani |
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Affiliation: | a Department of Electrical and Electronic Engineering Faculty of Engineering, University of Miyazaki, Miyazaki, Japan b Cooperative Research Center, University of Miyazaki, Miyazaki, Japan |
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Abstract: | We have observed the photo-chemical reaction process of organic molecules in gas phase induced by vacuum ultraviolet (VUV) radiation. We chose hydrocarbons that contain five carbons in a molecule as samples. To observe the wavelength dependence, three kinds of excimer lamps (Ar2*-126 nm, Kr2*-147 nm and Xe2*-172 nm) were used as light sources of the VUV radiation. Vaporized organic molecular compounds were irradiated by the VUV at a pressure of 12 Pa and detected by means of mass spectrometry. Change of the mass spectra with the irradiation period was measured. As a result, we found that different reaction rates were observed for the different compounds. In particular, 1-pentene and cyclopentane, which have the same molecular weight, have very different decomposition speeds for the irradiation of 172-nm radiation. The facts observed in this work are considered to be very promising for developing a technique to distinguish the targeted compound from others that have similar structures. |
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Keywords: | 89.20.Bb |
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