Photofragmentation of C60 in the extreme ultraviolet: Statistical analysis on the appearance energies of C60-2n z+ (n ≥ 1, z = 1-3)

Junkei Kou, Takanori Mori, Yoshihiro Kubozono, Koichiro Mitsuke

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Abstract

The ion yield curves for C60-2nz+ (n = 1-5, z = 1-3) produced by photoionization of C60 are measured in the photon energy (hν) range of 25-150 eV. The appearance hν values are higher by 30-33 eV than the thermochemical thresholds for dissociative ionization of C60 leading to C60-2nz+. Evaluation is made on the upper limits of the internal energies of the primary C60z+ above which C60-2n+2z+ fragments (n ≥ 1) cannot escape from further dissociating into C60-2nz+ C2. These upper limits agree well with the theoretical internal energies of C 60z+ corresponding to the threshold for the formation of C60-2nz+. The photofragmentation of C60 z+ is considered to be governed by the mechanism of internal conversion of the electronically excited states of C60z+, statistical redistribution of the excess energy among a number of vibrational modes, and sequential ejection of the C2 units.

Original languageEnglish
Pages (from-to)119-123
Number of pages5
JournalPhysical Chemistry Chemical Physics
Volume7
Issue number1
DOIs
Publication statusPublished - Jan 7 2005

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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