Study of Negative Ion Formations by Electron Impact I. Negative Ions Produced from Acrylonitrile
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概要
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Utilizing a conventional electron gun and mass spectrometer, the formation of negative ions at wide electron energies(0 to 100 ev)have been investigated for an acrylonitrile. The ionization efficiency curves have been obtained for the negative ions including C<SUP>-</SUP>, CH<SUP>-</SUP>, C<SUB>2</SUB><SUP>-</SUP>, C<SUB>2</SUB>H<SUP>-</SUP>, CN<SUP>-</SUP>, HCN<SUP>-</SUP>, C<SUB>3</SUB><SUP>-</SUP>, CCN<SUP>-</SUP>, CHCN<SUP>-</SUP>, C<SUB>2</SUB>CN<SUP>-</SUP>, C<SUB>2</SUB>HCN-and C<SUB>2</SUB>H<SUB>2</SUB>CN<SUP>-</SUP>. The appearance potentials of these negative ions have been determined for both processes of the dissociative resonance capture and ion-pair production, and some of the ions have two or more appearance potentials in each processes. The O-ions produced from O<SUB>2</SUB> and CO were used for an energy calibration establishing the appearance potentials, and SF<SUB>6</SUB><SUP>-</SUP>ions from SF<SUB>6</SUB> were also used on energy calibra tion for the electron energy near zero ev. The pressure effects of the formation of these negative ions have been studied in various electron energies over the whole pressure ranges(presumably from10<SUP>-4</SUP>to 10<SUP>-7</SUP> mmHg in the ionization chamber). From the studies of the pressure effects the negative ion formation, it has been observed that the intensities of the negative ions produced by the processes of all dissociative resonance capture were increased lineary for pressure increased, but on the other hand the processes of the ion-pair production indicated more complicated depen dency, that the dependencies of the ion intensity on the pressure have various mode among the ions from 1st to 4th order against the pressure. Possible explanations of the formation mechanisms of the negative ions are discussed.
- 日本質量分析学会の論文
著者
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Matsumoto Akira
Department Of Aeronautics And Astronautics Faculty Of Engineering Kyushu University
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ARAKAWA KAZUO
Japan Atomic Energy Research Institute, Takasaki Radiation Research Establishment
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ARAKAWA KAZUO
Japan Atomic Energy Research Institute, Takasaki Radiation Chemistry Research Establishment
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Sugiura T.
Japan Atomic Energy Research Institute, Takasaki Radiation Research Establishment
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SUGIURA TOSHIO
Japan Atomic Energy Research Institute, Takasaki Radiation Research Establishment
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MATSUMOTO AKIRA
Department of Chemistry, College of General Education, University of Osaka Prefecture
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