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1990 Fiscal Year Final Research Report Summary

Dissociation Dynamics of Doubly and Triply Charged Simple Gaseous Molecules Studied by Double and Triple Coincidence Method

Research Project

Project/Area Number 01540383
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 物理化学一般
Research InstitutionOsaka City University

Principal Investigator

MASUOKA Toshio  Osaka City University, Faculty of Engineering, Lecturer, 工学部, 講師 (80047208)

Co-Investigator(Kenkyū-buntansha) KOYANO Inosuke  Himeji Institute of Technology, Faculty of Science, Professor, 理学部, 教授 (80016089)
Project Period (FY) 1989 – 1990
KeywordsDouble ionization / Dissociative photoionization / Ionic fragment / Anisotropy of fragmentation / Kinetic energy distribution / Triple coincidence / Synchrotron radiation
Research Abstract

1. The triple coincidence PEPIPICO (photo electron-photoion-photoion) technique has been developed at the UVSOR facility of IMS (BL3A2) in Okazaki to study the dynamics of fragmentations of a di-or tri-cation into two charged and one neutral particle. Two dimensional expression of the triple coincidence spectra in real time was made possible by use of a personal computer and a video RAM. The dissociative double and triple photoionization of OCS was studied by this method at the excitation energy of 80eV. New information on the charge separation was obtained for the dissociation channels C^++ O^++S of OCS^<2+> and OC^++S^<2+> of OCS^<3+>.
2. The angular distribution of photo dissociation products is closely related to the symmetry of the transition processes involved and the molecular dissociation dynamics. We have observed angular distribution of fragment ions produced in the direct (not via Auger decay) double photoionization of OCS, CH_3F, and NO by use of synchrotron radiation and the photoion-photoion coincidence (PIPICO) method. The TOF mass spectrometer could be rotated throuqh 90^゚ around the photon beam in order to measure characteristic profiles of the PIPICO spectra. The present study shows that the anisotropy, observed here for the first time in the case of direct two-electron-ejection processes, can be understood in terms of symmetry-characterized-dissociation of the doubly charged parent ions.
3. The single, double, and triple photoionization cross sections of OCS and the ionic fragmentations of OCS^+, OCS^<2+>, and OCS^<3+> have been determined separately in the region 36-100eV by use of a TOF mass spectrometer and the PIPICO method together with synchrotron radiation from the UVSOR
4. Kinetic energy distributions of the fragment ions produced from OCS^<2+> and NO^<2+> were also determined.

  • Research Products

    (13 results)

All Other

All Publications (13 results)

  • [Publications] S.Nagaoka: "Dissociative double ionization following valence and Al:2p core level photoexcitation of Al(CH_3)_3" Phys.Scr.41. 472-474 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Imamura: "Dissociative single,double and triple photoionization of silicon tetrafluoride in the valence shell and silicon 2pなregions (hv=33ー133ev)" J.Chem.Phys.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Masuoka: "Dissociative single,double,and triple photoionization of OCS in the region hv=20ー100eV studied by mass spectrometry and photoionーphotoion coincidence method" J.Chem.Phys.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Masuoka: "Dissociative single and double photoionization of CH_3F in the region 20ー110eV studied by mass spectrometry and photoionーphotoion coincidenceーmethod" J.Chem.Phys.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Masuoka: "Anisotropic angular distribution of fragment ions in dissociative double photoionization of OCS" Phys.Rev.A.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Nagaoka: "Dissociative photoionization of Al_2(CH_3)_6 and Al_2(CH_3)_3Cl_3 in the range 40ー100eV" Appl.Organomet.Chem.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T. Masuoka: "Construction of a new apparatus for angle and energy resolved measurements of photoelectrons and photoions" Rev. Sci. Instrum. 60. 2179-2181 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S. Nagaoka: "Dissociative double ionization following valence and Al : 2p core level photoexcitation of Al(CH_3)_3" Phys. Scr. 41. 472-474 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Imamura: "Dissociative Single, double and triple photoionization of silicon tetrafluoride in the valence shell and silicon 2P regions (hv=33-133eV)" J. Chem. Phys.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Masuoka: "Dissociative single, double, and triple photoionization of OCS in the region hV=20-100eV studied by mass spectrometry and photoion-photoion coincidence method" J. Chem. Phys.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Masuoka: "Dissociative single and double photoionization of CH_3F in the region 20-110eV studied by mass spectrometry and photoion-photoion coincidence method" J. Chem. Phys.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Masuoka: "Anisotropic angular distribution of fragment ions in dissociative double photoionization of OCS" Phys. Rev. A.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S. Nagaoka: "Dissociative photoionization of Al_2(CH_3)_6 and Al_2(CH_3)_3 Cl_3 in the range 40-100eV" Appl. Organomet. Chem.

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1993-08-12  

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