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2006 Fiscal Year Final Research Report Summary

Elucidation of novel photoinduced dissociation dynamics of metal-molecule gas-phase complex ions and its control

Research Project

Project/Area Number 17350003
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Physical chemistry
Research InstitutionTohoku University

Principal Investigator

MISAIZU Fuminori  Tohoku University, Graduate School of Science, Associate professor, 大学院理学研究科, 助教授 (20219611)

Project Period (FY) 2005 – 2006
Keywordscluster / photodissociation / excited state / dissociation dynamics / complex ion / laser spectroscopy / electron transfer
Research Abstract

Photofragment angular and energy distributions have been extensively examined in the gas phase photodissociation studies on various molecules because of their importance to obtain dynamical information. In this study, we have systematically examined time-of-flight (TOF) profiles of fragment ions for Mg^+-XCH_3(X=F,Cl,Br, and I) and discussed the product energy distributions as well as the angular distributions to get further information on the photodissociation dynamics of these complexes.
In the photodissociation of Mg^+-ICH_3,five kinds of ions, CH_3^+,Mg^+,I^+,ICH_3^+,and MgI^+ were observed as fragment ions. Among these ions, anisotropic distributions were observed in the TOF profiles of ICH_3^+ and MgI^+ whereas other ions had isotropic distributions. For Mg^+-FCH_3,fragment ions of CH_3^+,Mg^+ and MgF^+ were observed and these ions also showed spatial anisotropy except for mg+. Observed features in the TOF spectra could be qualitatively explained by local excitations of the Mg^+ i … More on (3P_z←3s electron excitation, transition moment vector p is parallel to an Mg-X bond axis) and geometrical structures of the parent complexes. Anisotropy parameters of ICH_3^+ and MgI^+ were determined to be +1.30 and -0.50, respectively, which were 〜60% of the values expected by geometries of the parent ions neglecting rotations of the complex. On the other hand, those of CH_3^+ and MgF^+ formed from Mg^+-FCH_3 were +0.75 for both ions (<40 % of the expected values). In addition, kinetic energy release distributions were also determined for these systems. For iodide system, more than 40 % of available energy was found to be partitioned into translational energy for both ICH_3^+ and MgI^+ ions, whereas energy transfer for fluoride system was about 16 %. From estimations by using statistical or nonstatistical models, nonstatistical processes were more important in the dissociation to produce ICH_3^+ and MgI^+ than the CH_3^+ and MgI^+ formation. This means that the rapid dissociations compared with the rotational period of the parent complex would occur in the iodide system which is consistent with the consideration from the potential energy surfaces. Less

  • Research Products

    (12 results)

All 2007 2006 2005

All Journal Article (12 results)

  • [Journal Article] Photoinduced Dissociation Reactions of Silver Fluoride Cluster Ions2007

    • Author(s)
      N.Hori et al.
    • Journal Title

      European Physical Journal D (印刷中)

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Photoinduced Dissociation Reactions of Silver Fluoride Cluster Ions2007

    • Author(s)
      N.Hori, A.Furuya, M.Tsuruta, F.Misaizu, K.Ohno
    • Journal Title

      European Phys.J.D (in press)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Photodissociation of Mg^+-CH_3X (X=F, Cl, Br, and I) Complexes. I. Electronic Spectra and Dissociation Pathways2006

    • Author(s)
      A.Furuya, F.Misaizu, K.Ohno
    • Journal Title

      Journal of Chemical Physics 125

      Pages: 094309(12)

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Photodissociation of Mg^+-CH_3X (X=F,Cl,Br,and I) Complexes. II. Fragment Angular and Energy Distributions2006

    • Author(s)
      A.Furuya, F.Misaizu, K.Ohno
    • Journal Title

      Journal of Chemical Physics 125

      Pages: 094310(14)

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Photodissociation of Mg^+-CH_3X (X=F,Cl,Br,and I) Complexes. I.Electronic Spectra and Dissociation Pathways2006

    • Author(s)
      A.Furuya, F.Misaizu, K.Ohno
    • Journal Title

      J.Chem.Phys. 125

      Pages: 094309 (12)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Photodissociation of Mg^+-CH_3X (X=F,Cl,Br,and I) Complexes. II.Fragment Angular and Energy Distributions2006

    • Author(s)
      A.Furuya, F.Misaizu, K.Ohno
    • Journal Title

      J.Chem.Phys. 125

      Pages: 094310 (14)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Electron Distribution and Intracluster Reaction in Na_n(CS_2)_2-Negative Ion Clusters2005

    • Author(s)
      H.Tsunoyama et al.
    • Journal Title

      European Physical Journal D 34

      Pages: 89-92

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Adsorption Reaction of Polar Organic Molecules on Si_n^+ Cluster Ions2005

    • Author(s)
      W.Nakagawara et al.
    • Journal Title

      International Journal of Modern Physics B 19

      Pages: 2502-2507

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Size-Dependent Structures of Na_nI_<n-1>^+ Cluster Ions with a Methanol Adsorbate : A Combined Study by Photodissociation Spectroscopy and Density Functional Theory Calculation2005

    • Author(s)
      F.Misaizu et al.
    • Journal Title

      Journal of Chemical Physics 123

      Pages: 161101(4)

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Electron Distribution and Intracluster Reaction in Na_n(CS_2)_2^- Negative Ion Clusters2005

    • Author(s)
      H.Tsunoyama, Y.Yasumura, K.Ohshimo, F.Misaizu, K.Ohno
    • Journal Title

      European Phys.J.D 34

      Pages: 89-92

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Adsorption Reaction of Polar Organic Molecules on Si_n^+ Cluster Ions2005

    • Author(s)
      W.Nakagawara, H.Tsunoyama, A.Furuya, F.Misaizu, K.Ohno
    • Journal Title

      Int.J.Mod.Phys.B 19

      Pages: 2502-2507

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Size-Dependent Structures of Na_nI_<n-1>^+ Cluster Ions with Methanol Adsorbate : A Combined Study by Photodissociation Spectroscopy and Density Functional Theory Calculation2005

    • Author(s)
      F.Misaizu, M.Tsuruta, H.Tsunoyama, A.Furuya, K.Ohno, M.Lintuluoto
    • Journal Title

      J.Chem.Phys. 123

      Pages: 161101 (4)

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

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Published: 2008-05-27  

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