Site-Specific Chemical-Bond Scission in Poly(Methyl Methacrylate) by Inner Shell Excitation
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概要
- 論文の詳細を見る
The results of photon-stimulated ion desorption (PSID) from thin solid films of poly(methyl methacrylate) (PMMA) and corresponding polymers, poly(methyl acrylate) (PMA) and poly(methacrylic acid) (PMAA), owing to inner-shell excitation, are briefly reviewed. The results show that an enhancement of PSID takes place effectively upon electron excitation to a particular antibonding molecular orbital, indicating that the excitation to the antibonding state plays a major role in PSID enhancement. As a typical example, CH_3^+ desorption via oxygen 1s electron excitation was shown as a function of photon energy. By comparison of the photon energy dependences of PSID yields of CH_3^+ from the three polymers, it was found that the excitation of oxygen 1s electron at OCH_3 to the σ^* state localized at COCH_3 in PMMA results in the enhanced emission of CH_3^+ by bond scission at the side chain (O-CH_3), not at the main chain. The results indicate that there is a strong correlation between the sites of excitation and the following chemical-bond rupture. It is pointed out that monochromatic synchrotron radiation can be used as a "scalpel" to cut a chemical bond selectively in a molecular solid.
- 社団法人応用物理学会の論文
- 1997-12-30
著者
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Ueno Nobuo
Institute For Molecular Science:department Of Materials Science Faculty Of Engineering Chiba Univers
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Tanaka K
Murata Manufacturing Co. Ltd.
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Tanaka Kenichiro
Department Of Cardiovascular Surgery Kitakyushu Municipal Medical Center
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Tanaka Kenichiro
Department Of Cardiovascular Surgery Cardiovascular Center Iizuka Hospital
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