Negative Ion-Molecule Reactions in Formic Acid

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概要

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• Negative ion-molecule reaction has been investigated for formic acid utilizing a conventional type mass spectrometer. At elevated pressure negative ions react with neutral species in the ion source of mass spectrometer. It was found that a negative ion of mass 91 is produced by the reaction of the HCOO- ion with neutral formic acid asHCOO-+HCOOH→HCOOHCOOH-This reaction has two processes, i.e. a dissociative resonance electron capture (DREC) process and a high energy electron process. From the studies of HCOOH gas pressure dependence it was observed that the intensities of the HCOO- and HCOOHCOOH- ions in a DREC process increase with first and second order of the HCOOH gas pressure, whereas in a high energy electron process, they increase with fourth and seventh order of the pressure, respectively. The reaction rate constants of two processes were determined as (6.8 ±1.5) ×10-13 cc/molecule.sec for a DREC process and (1.3 ±0.5) ×10-37 cc3/molecule3·sec for a high energy electron process.

• 日本質量分析学会の論文

著者

• ARAKAWA Kazuo

  Takasaki Advanced Radiation Research Institute, Japan Atomic Energy Agency

• Arakawa Kazuo

  Takasaki Advanced Radiation Research Institute Japan Atomic Energy Agency

• SEGUCHI Tadao

  Takasaki Radiation Chemistry Research Establishment, Japan Atomic Energy Research Institute

• Seguchi Tadao

  Takasaki Radiation Chemistry Research Establishment Japan Atomic Energy Research Institute

• Sugiura Toshio

  Department of Chemistry, Faculty of Liberal Arts and Sciences, University of Osaka Prefecture

• Arakawa Kazuo

  Takasaki Radiation Chemistry Research Establishment, Japan Atomic Energy Research Institutekn-affil=

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