Photoionization and photofragmentation of the C60+ molecular ion
Photoionization and photofragmentation of the C60+ molecular ion
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C60 分子离子的光电离和光碎裂
DOI：
10.1103/physreva.93.033401
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发表时间：
2016
影响因子：
2.9
通讯作者：
R. A. Phaneuf
中科院分区：
文献类型：
--
作者：
K. K. Baral;N. B. Aryal;D. A. Esteves-Macaluso;C. M. Thomas;J. Hellhund;R. Lomsadze;A. L. D. Kilcoyne;A. Müller;S. Schippers;R. A. Phaneuf
据报道，在18-150 eV的光子能量范围内，单光子电离和双光子电离导致0 - 7对碳原子的损失，以及在18-65 eV的光子能量范围内，不电离导致2 - 8对C原子损失的碎片的截面测量。绝对测量是通过将一束分子离子与一束单色同步辐射合并来实现的。涉及解离产生较小富勒烯碎片离子的产物通道占该能量范围内测量的总振荡器强度的近一半。测量产物通道的横截面总和与发表的基于时变密度泛函理论的中性物总光吸收横截面的计算进行了比较。这种比较和振荡器强度的计算表明，除了，由光吸收引起的最重要的产品通道在实验中被考虑在内。伴随光电离的碳原子对的连续去除的阈值能量也由测量确定。
Cross-section measurements are reported for single and double photoionization ofions in the photon energy range 18–150 eV accompanied by the loss of zero to seven pairs of carbon atoms, as well as for fragmentation without ionization resulting in loss of two to eight pairs of C atoms in the photon energy range 18–65 eV. Absolute measurements were performed by merging a beam ofmolecular ions with a beam of monochromatized synchrotron radiation. Product channels involving dissociation yielding smaller fullerene fragment ions account for nearly half of the total measured oscillator strength in this energy range. The sum of cross sections for the measured product channels is compared to a published calculation of the total photoabsorption cross section of neutralbased on time-dependent density-functional theory. This comparison and an accounting of oscillator strengths indicate that with the exception of, the most important product channels resulting from photoabsorption were accounted for in the experiment. Threshold energies for the successive removal of carbon atom pairs accompanying photoionization are also determined from the measurements.