Revisiting Laser-Intensity-Dependent Ionization and Fragmentation of C60  

作　　者：D.P.Dong B.H.Yang D.B.Qian W.C.Zhou S.F.Zhang X.Ma 董达谱;杨博涵;钱东斌;周文长;张少锋;马新文(Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China [2]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Chinese Physics Letters》2021年第8期32-37,共6页中国物理快报（英文版）

基　　金：the National Key R&D Program(Grant No.2017YFA0402300);the National Natural Science Foundation of China(Grant Nos.11974359 and U1632143)。

摘　　要：We revisit the laser-intensity-dependent ionization and fragmentation yields of C60 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 C60.Indeed,we find that the saturation intensities for C60 ionizations and the onset intensity for C60 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.

关 键 词：FRAGMENTATION SATURATION IONIZATION 

分 类 号：O561[理学—原子与分子物理]