Absolute Total Photoionization Cross Section of C_<60> in the Range of 25-120eV: Revisited(Atomic and molecular physics)

概要

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The absolute total photoionization cross section σ_<abs, I> of gaseous C_<60> is measured in the photon energy hv range from 25 to 120eV by photoionization mass spectrometry with synchrotron radiation. The absolute detection efficiencies of photoions in different charge states are evaluated. The present σ_<abs, I> curve is combined with the photoabsorption cross section curves of C_<60> at hv=3.5-26eV in the literature, after appropriate alterations of the vapor pressure are taken into account. The oscillator strengths are computed from the composite curve to be 178.5 and 230.5 for the hv ranges from 3.5 to 40.8eV and from 3.5 to 119eV, respectively. These oscillator strengths agree well with those expected from the Thomas-Kuhn-Reiche sum rule and 60 times the photoabsorption cross section of a carbon atom. Moreover, the present σ_<abs, I> curve behaves similarly to the relative photoionization cross section curve reported by Reinkoster et al.
社団法人日本物理学会の論文
2008-01-15