Photofragmentation of C60 in the extreme ultraviolet: statistical analysis on the appearance energies of C60−2nz+ (n ≥ 1, z = 1–3)
文献情報
Junkei Kou, Takanori Mori, Yoshihiro Kubozono
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 C60z+ corresponding to the threshold for the formation of C60−2nz+. The photofragmentation of C60z+ 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.
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