Double Ionization of Nitrogen from Multiple Orbitals

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• 作者：Zhifeng Wu ; Chengyin Wu ; Xianrong Liu ; Yongkai Deng ; Qihuang Gong ; Di Song ; Hongmei Su
• 刊名：Journal of Physical Chemistry A
• 出版年：2010
• 出版时间：July 1, 2010
• 年：2010
• 卷：114
• 期：25
• 页码：6751-6756
• 全文大小：194K
• 年卷期：v.114,no.25(July 1, 2010)
• ISSN：1520-5215

文摘

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 N₂²⁺ are metastable while others dissociate through charge symmetric dissociation (N₂²⁺ → N⁺ + N⁺) or charge asymmetric dissociation (N₂²⁺ → N²⁺ + 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.