VUV Photoionization Efficiency Curves and Appearance Energies of N,N-Dimethylformamide Ion and Its Fragment Ions.
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概要
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Ionization efficiency curves of <I>N</I>,<I>N</I>-dimethylformamide (DMF) ion and of its fragment ions, C<SUB>3</SUB>H<SUB>6</SUB>NO<SUP>+</SUP>, C<SUB>2</SUB>H<SUB>4</SUB>NO<SUP>+</SUP>, and C<SUB>2</SUB>H<SUB>6</SUB>N<SUP>+</SUP> were obtained by use of vacuum ultraviolet photoionization method. The appearance energy of the parent ion was 9.12±0.06 eV. The appearance energies of C<SUB>3</SUB>H<SUB>6</SUB>NO<SUP>+</SUP>, C<SUB>2</SUB>H<SUB>4</SUB>NO<SUP>+</SUP>, and C<SUB>2</SUB>H<SUB>6</SUB>N<SUP>+</SUP> were very close (10.77±0.08 eV for C<SUB>3</SUB>H<SUB>6</SUB>NO<SUP>+</SUP> and C<SUB>2</SUB>H<SUB>4</SUB>NO<SUP>+</SUP>, 10.59±0.08 eV for C<SUB>2</SUB>H<SUB>6</SUB>N<SUP>+</SUP>). The relative intensity curve of C<SUB>2</SUB>H<SUB>6</SUB>N<SUP>+</SUP> normalized by the sum of fragment ions vs. photon energy has the second rise at 12.2±0.3 eV, which implies that another fragmentation process appears at the photon energy above 12.2 eV. The second fragmentation process is ascribed to a channel through DMF cation in an excited electronic state.
- 公益社団法人 日本化学会の論文
著者
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Arimura Masana
Institute of Chemistry, College of General Education, Osaka University
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Yoshikawa Yozaburo
Institute of Chemistry, College of General Education, Osaka University
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- VUV Photoionization Efficiency Curves and Appearance Energies of N,N-Dimethylformamide Ion and Its Fragment Ions.