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1995 Fiscal Year Final Research Report Summary

Production and dissociation dynamics of singly, doubly, and triply charged positive molecular ions by photon impact

Research Project

Project/Area Number 06640663
Research Category

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

Allocation TypeSingle-year Grants
Research Field Physical chemistry
Research InstitutionOsaka City University

Principal Investigator

MASUOKA Toshio  Osaka City University Faculty of Engineering, Professor, 工学部, 教授 (80047208)

Project Period (FY) 1994 – 1995
KeywordsDouble ionization / Dissociative ionization / Ion branching ratio / Synchrotron radiation / Kinetic-energy release / Double ionization cross section / Ion-ion coincidence / Triple coincidence
Research Abstract

Single, double, and triple photoionization of molecules such as NO,CO,CO_2, SO_2, and NO_2 has been investigated by using a multi coincidence (photoelectron-photoion, photoion-photoion, photoelectron-photoion-photoion coincidence) system installed at BL3A2, the UVSOR facility of the Institute for Molecular Science, Okazaki. The following are the interesting results obtained on the production and dissociation dynamics of singly, doubly, and triply charged positive molecular ions using synchrotron radiation.
1.The ratio of double to single photoionization, and the single and double photoionization cross sections were determined for CO_2, SO_2, and NO_2. This made possible to determine separately the ion branching ratios of the precursors m^+ and m^<2+> at the excitation energy where the molecular and dissociative single and double photoionization takes place simultaneously.
2.Kinetic-energy release in the dissociation of m^<2+> was investigated by analyzing the photoion-photoion coincidence spectra from the double photoionization threshold to 100 eV.The results show that a major fraction of double photoionization of small molecules at low energy is due to indirect processes such as the nonresonant (m^<+*>) and resonant (m^<**>) autoionization.
3.The dissociation dynamics of CO_2^<2+> and NO_2^<2+> was examined by using triple photoelectron-photoion-photoion coincidence (PEPIPICO) method. The PEPIPICO method is important to study three-body dissociations whether the dissociation is a simultaneous or sequential process.

  • Research Products

    (14 results)

All Other

All Publications (14 results)

  • [Publications] T.Masuoka: "Kinetic-energy release in the dissociation of NO^<2+>" Journal of Chemical Physics. 100. 6422-6428 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Masuoka: "Kinetic-energy release in the dissociation of CO^<2+>" Journal of Chemical Physics. 101. 322-327 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Masuoka: "observation of anisotropic angular distribution of ionic fraginerts in the dissociation of CO^<2+>" Physical Review A. 50. 2298-2303 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Masuoka: "Single-and double-photoionization cross sections of carbon dioxide(CO_2) and ionic fragmentation of CO^+_2 and CO^<2+>_2" Physical Review A. 50. 3886-3894 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Masuoka: "Sigle,double,and triple photoionization of mdecules using synchrotron radiation" Canadian Journal of Physics. 74(印刷中). (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Masuoka: "Kineitc-energy release in the dissociation of CO^<2+>_2" Journal of Chemical Physics. 104(印刷中). (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Masuoka: "Trends in Chemical Physics,3" Council of Scientific Information, (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Masuoka: "Kinetic-energy release in he dissociation of NO^<2+>" J.Chem.Phys.100. 6422 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Masuoka: "Kinetic-energy release in the dissociation of CO^<2+>" J.Chem.Phys.101. 322 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Masuoka: "Observation of anisotropic angular distribution of ionic fragments in the dissociation of CO^<2+>" Phys.Rev.A. 50. 2298 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Masuoka: "Single-and double-photoionization cross sections of carbon dioxide (CO_2) and ionic fragmentation of CO_2^+ and CP_2^<2+>" Phys.Rev.A.50. 3886 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Masuoka: "Single, double, and triple photoionization of molecules using synchrotron radiation" Can.J.Phys.74 (in press). (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Masuoka: "Kinetic-energy release in the dissociation of CO_2^<2+>." J.Chem.Phys.104 (in press). (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Masuoka: "Council of Scienctific Information" Trends in Chemical Physics. 3.

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

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Published: 1997-03-04  

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