Photoion spectra of C60 molecules at resonance excitation and ionization energies near the C 1s edge
Photoion spectra of C60 molecules at resonance excitation and ionization energies near the C 1s edge
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C60 分子在共振激发和 C 1s 边缘附近的电离能下的光电子光谱
DOI：
10.1063/1.473442
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发表时间：
1997
影响因子：
4.4
通讯作者：
S. Aksela
中科院分区：
文献类型：
--
作者：
J. Karvonen;E. Nõmmiste;H. Aksela;S. Aksela
采用飞行时间质谱法研究了同步加速器辐射选择性激发后气相 C60 分子的光电离动力学。从先前的光电子和俄歇电子能谱推导出来的能级方案用于分析光离子数据。在 π* 前边缘共振附近，多电荷离子的分裂随着光子能量的变化而强烈变化。 C60+ 离子产率在 1 秒阈值后缓慢下降，表明慢速光电子可以被重新捕获。稍高于阈值，母体 C60+ 离子的相对碎裂增强表明由于 20 eV 光电子而激发了巨等离子体共振。
Photoionization dynamics of gas-phase C60 molecules after selective excitation with synchrotron radiation has been studied with time-of-flight mass spectrometry. The energy level scheme deduced from previous photoelectron and Auger electron spectra is used to analyze the photoion data. At the vicinity of π* pre-edge resonances the fragmentation of multiply-charged ions varies strongly as a function of photon energy. The C60+ ion yield decreases slowly after 1s threshold indicating that the slow photoelectrons can get recaptured. Somewhat further above the threshold the enhanced relative fragmentation of the parent C60+ ions suggests excitation of the giant plasmon resonance due to 20 eV photoelectrons.