Mass spectrometric studies of some carboxylic acid dimers produced by a nozzle beam: HCO2H,CH3CO2H,C2H5CO2H,and n-C3H7CO2H.
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概要
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Characteristic ions (M+1)<SUP>+</SUP> and (M+45)<SUP>+</SUP>, assigned to be the protonated monomer ion MH<SUP>+</SUP> and (M·CO<SUB>2</SUB>H)<SUP>+</SUP> respectively, have been detected in the mass spectrometric measurements of the dimer molecules M<SUB>2</SUB> and the higher clusters M<SUB>n</SUB> of some carboxylic acids produced in their nozzle beams. It has been shown from the dependences of their relative intensities on the stagnation conditions that these ions are mainly formed through the fragmentation of the dimer ions. The MH<SUP>+</SUP> ion plays the most important role in these fragmentation processes of the dimers, while no dimer ion M<SUB>2</SUB><SUP>+</SUP> was observed. These results are discussed in terms of the enthalpy changes for the unimolecular decomposition reactions of M<SUB>2</SUB><SUP>+</SUP>.
- 公益社団法人 日本化学会の論文
著者
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Mori Yoshihiro
Department Of Chemistry Faculty Of Science Hokkaido University
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Nagahara Shigeru
Department Of Industrial Chemistry Suzuka College Of Technology
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Kitagawa Taiji
Department Of Pharmaceutical Sciences Toyama Medical And Pharmaceutical University
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MORI Yoshihiro
Department of Pharmaceutical Sciences, Toyama Medical and Pharmaceutical University
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Yamamoto Tomoki
Department of Materials Science, School of Engineering, The University of Shiga Prefecture, Hikone, Shiga 522-8533, Japan
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Nagahara Shigeru
Department of Pharmaceutical Sciences, Toyama Medical and Pharmaceutical University
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Yanada Kazuo
Department of Pharmaceutical Sciences, Toyama Medical and Pharmaceutical University
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