The European Physical Journal D

, Volume 43, Issue 1–3, pp 23–26 | Cite as

Photodissociation spectroscopy of the chromium trimer ion

  • T. Majima
  • K. Tono
  • A. Terasaki
  • Y. Kawazoe
  • T. Kondow
Structure and Thermodynamics of Free Clusters


The electronic and geometric structures and photodissociation dynamics of the chromium trimer ion, Cr3 +, were investigated by photodissociation spectroscopy in the photon-energy range from 1.32 to 5.52 eV. The branching fractions of the product ions, Cr+ and Cr2 +, exhibit stepwise changes at the threshold energies for dissociation into Cr++Cr2, Cr+Cr2 +, Cr++2Cr, and Cr*+Cr2 +. It is noted that Cr2 + is produced even above the threshold for atomization; the excess energy is redistributed to produce a fragment atom, Cr*, in an excited state. The photodissociation action spectrum is well explained by a mixture of simulated spectra for two nearly-degenerate structural isomers identified by density functional calculations: those having a metastable C2v structure and the most stable structure slightly distorted from the C2v one. The barrier height between the two isomers which is lower than the zero-point energy suggests that Cr3 + has an intrinsically floppy structure.


36.40.Mr Spectroscopy and geometrical structure of clusters 36.40.Qv Stability and fragmentation of clusters 36.40.Cg Electronic and magnetic properties of clusters 


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Copyright information

© EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2007

Authors and Affiliations

  • T. Majima
    • 1
  • K. Tono
    • 1
  • A. Terasaki
    • 2
  • Y. Kawazoe
    • 3
  • T. Kondow
    • 2
  1. 1.East Tokyo Laboratory, Genesis Research InstituteChibaJapan
  2. 2.Cluster Research Laboratory, Toyota Technological Institute, in East Tokyo Laboratory, Genesis Research InstituteChibaJapan
  3. 3.Institute for Materials Research, Tohoku UniversitySendaiJapan

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