Revisiting Laser-Intensity-Dependent Ionization and Fragmentation of C$_{60}$
D. P. Dong1,2 , B. H. Yang1,2 , D. B. Qian1,2* , W. C. Zhou1,2 , S. F. Zhang1,2 , and X. Ma1,2*
1 Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China2 University of Chinese Academy of Sciences, Beijing 100049, China
Abstract ：We revisit the laser-intensity-dependent ionization and fragmentation yields of C$_{60}$ molecules irradiated by 25-fs, 798-nm laser pulses based on the approach in which photoions are measured via a velocity map imaging spectrometer working in a time-sliced mode. This approach dramatically improves the signal-to-background ratio compared to those using a simple (traditional) time-of-flight mode (spectrometer), and thus allows us to measure the laser-intensity dependences down to a previously untouched region, which is expected to provide new insights into the intense-field ionization and fragmentation of C$_{60}$. Indeed, we find that the saturation intensities for C$_{60}$ ionizations and the onset intensity for C$_{60}$ fragmentation are much lower than those reported in previous experiments. Furthermore, the derived saturation-intensity dependence on charge distribution demonstrates the validity of the over-the-barrier ionization using a conducting sphere model.
收稿日期: 2021-04-01
出版日期: 2021-08-02
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2021, Vol. 38 
