Double ionization of nitrogen from multiple orbitals.
Double ionization of nitrogen from multiple orbitals.
复制标题
DOI：
10.1021/jp1018197
复制
发表时间：
2010-07
期刊：
影响因子：
--
通讯作者：
Zhifeng Wu;Chengyin Wu;Xianrong Liu;Yongkai Deng;Q. Gong;D. Song;Hongmei Su
中科院分区：
文献类型：
--
作者：
Zhifeng Wu;Chengyin Wu;Xianrong Liu;Yongkai Deng;Q. Gong;D. Song;Hongmei Su
在强飞秒激光场中，分子可以从多个价轨道隧道电离，从而产生不同电子态的分子离子。在本文中，我们使用反应显微镜研究强飞秒激光脉冲对氮的双电离。研究发现，一些双电荷分子离子 N(2)(2+) 是亚稳态的，而另一些则通过电荷对称解离 (N(2)(2+) --> N(+) + N(+)) 或电荷不对称解离 (N(2)(2+) --> N(2+) + N) 解离。测量离解通道的动能释放和原子离子的角度分布。借助 CASSCF 和 MRCI 计算，可以识别电子态，并讨论价轨道对这些解离分子双键的贡献。
In intense femtosecond laser fields, molecules could be tunnel ionized from multiple valence orbitals, which produces molecular ions in different electronic states. In this article, we have used a reaction microscope to study double ionization of nitrogen by intense femtosecond laser pulses. It is found that some doubly charged molecular ions N(2)(2+) are metastable while others dissociate through charge symmetric dissociation (N(2)(2+) --> N(+) + N(+)) or charge asymmetric dissociation (N(2)(2+) --> N(2+) + N). The kinetic energy releases and angular distributions of atomic ions are measured for the dissociation channels. With the aid of the CASSCF and MRCI calculations, the electronic states are identified and the contributions of the valence orbitals are discussed for these dissociated molecular dications.