Absorption spectrum of C60 in the gas phase: Autoionization via core‐excited Rydberg states
Absorption spectrum of C60 in the gas phase: Autoionization via core‐excited Rydberg states
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C60 在气相中的吸收光谱：通过核心激发里德伯态的自电离
DOI：
10.1063/1.470813
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发表时间：
1996
影响因子：
4.4
通讯作者：
K. Shobatake
中科院分区：
文献类型：
--
作者：
H. Yasumatsu;T. Kondow;H. Kitagawa;K. Tabayashi;K. Shobatake
测量了C60在气相（830-870 K）的绝对吸收截面与光子能量（3.5-11.4 eV）（吸收光谱）的关系。在7.87、8.12、8.29、9.2 eV处观察到的吸收峰和8.45 eV处的下降峰被分配为涉及超激发态的光激发中的费什巴赫共振。产生7.87、8.12和9.2 eV峰的超激发态被认为是核心激发里德堡态，它们分别收敛于C60的第二、第三和第四电离极限（8.89、9.12、10.82-11.59 eV）。8.29 eV的峰值被认为是由产生8.12 eV峰值的超激发态的一个完全对称的五边形夹尖模的振动激发产生的。此外，根据测量的吸收截面和报告的相对光电离截面估计了相对光电离量子产率。在8ev附近，由于离子的高自离效率，产率显著提高。
The absolute absorption cross section of C60 in the gas phase (830–870 K) was measured as a function of the photon energy (3.5–11.4 eV) (absorption spectrum). Absorption peaks at 7.87, 8.12, 8.29, 9.2 eV and a dip at 8.45 eV observed are assigned as Feshbach resonances in the photoexcitation involving superexcited states. The superexcited states responsible for the 7.87, 8.12, and 9.2 eV peaks are assigned to be core‐excited Rydberg states converging to the second, the third and the fourth ionization limits of C60 (8.89, 9.12, 10.82–11.59 eV), respectively. The 8.29 eV peak is considered to originate from vibrational excitation of a totally symmetric pentagonal pinch mode of the superexcited state responsible for the 8.12 eV peak. Further, a relative photoionization quantum yield was estimated from the absorption cross section measured and the relative photoionization cross section reported. The yield increases particularly in the vicinity of 8 eV in accordance with a high efficiency of autoionization of ...