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异核双原子和三原子分子在红外强激光场中的电离抑制
赵磊,王瑞,张世文,杨天祥,连艺,吕航*,徐海峰*
作者单位E-mail
赵磊 吉林大学原子与分子物理研究所, 长春 130012;东北电力大学理学院, 吉林 132012  
王瑞 吉林大学原子与分子物理研究所, 长春 130012  
张世文 吉林大学原子与分子物理研究所, 长春 130012  
杨天祥 吉林大学原子与分子物理研究所, 长春 130012  
连艺 吉林大学原子与分子物理研究所, 长春 130012  
吕航* 吉林大学原子与分子物理研究所, 长春 130012 lvhang0811@jlu.edu.cn 
徐海峰* 吉林大学原子与分子物理研究所, 长春 130012 xuhf@jlu.edu.cn 
摘要:
关键词:  
DOI:10.1063/1674-0068/30/cjcp1711209
分类号:
基金项目:This work was supported by the National Natural Science Foundation of China (No.11534004, No.U1532138, and No.11704149).
Ionization Suppression of Heteronuclear Diatomic and Triatomic Molecules in Strong Infrared Laser Fields
Lei Zhao,Rui Wang,Shi-wen Zhang,Tian-xiang Yang,Yi Lian,Hang Lv*,Hai-feng Xu*
Abstract:
Ionization is the fundamental process in interaction of atoms/molecules with femtosecond strong laser fields. Comparing to atoms, molecules exhibit peculiar behaviors in strong-field ionization because of their diverse geometric structures, molecular electronic orbitals as well as extra nuclear degrees of freedom. In this study, we investigate strong field single and double ionization of carbon monoxide (CO) and carbon dioxide (CO2) in linearly polarized 50-fs, 800-nm laser fields with peak intensity in the range of 2×1013 W/cm2 to 2×1014 W/cm2 using time-of-flight mass spectrometer. By comparing the ionization yields with that of the companion atom krypton (Kr), which has similar ionization potential to the molecules, we investigate the effect of molecular electronic orbitals on the strong-field ionization. The results show that comparing to Kr, no significant suppression is observed in single ionization of both molecules and in non-sequential double ionization (NSDI) of CO, while the NSDI probability of CO2 is strongly suppressed. Based on our results and previous studies on homonuclear diatomic molecules (N2 and O2), the mechanism of different suppression effect is discussed. It is indicated that the different structure of the highest occupied molecular orbitals of CO and CO2 leads to distinct behaviors in two-center interference by the electronic wave-packet and angular distributions of the ionized electrons, resulting in different suppression effect in strong-field ionization.
Key words:  Strong laser field  Molecule  Ionization suppression