Predissociation dynamics of N(2)O(+) at the A (2)Sigma(+) state: Three pathways to form NO(+)((1)Sigma(+)) revealed from ion velocity imaging.
Predissociation dynamics of N(2)O(+) at the A (2)Sigma(+) state: Three pathways to form NO(+)((1)Sigma(+)) revealed from ion velocity imaging.
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DOI：
10.1063/1.3457945
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发表时间：
2010-06
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影响因子：
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通讯作者：
H. Wang;Xiaoguo Zhou;Shilin Liu;B. Jiang;D. Dai;Xueming Yang
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作者：
H. Wang;Xiaoguo Zhou;Shilin Liu;B. Jiang;D. Dai;Xueming Yang
用离子速度成像技术研究了一氧化二氮离子（N（2）O（+））在第一激发态A（2）Sigma（+）的预解离动力学.在360.55nm处，通过对喷射冷却的N（2）O分子进行共振增强多光子电离（REMPI），在基态X（2）Pi（000）处制备了N（2）O（+），在280-320 nm波长范围内，将其激发到A（2）Sigma（+）态的不同振动能级，然后预解离成NO（+）和N碎片。根据离子速度图像确定了NO（+）碎片的内能分布。借助N（2）O（+）的势能面（PES），我们提出了三种分解途径来解释具有不同内态分布的三种NO（+）碎片：（1）A（2）Sigma（+）态通过结合的1（4）Pi态耦合到解离的1（4）Sigma（-）态以形成NO（+）+N（（4）S）通道，其中NO（+）片段是旋转热的;（2）A（2）Sigma（+）状态经由1（4）Pi状态耦合到解离状态（2）Sigma（-）/（2）Delta以形成NO（+）+N（（2）D）通道，其中NO（+）片段也是旋转热的;（3）A（2）Sigma（+）态耦合到基态X（2）Pi的高能区，然后解离形成NO（+）+N（（2）D）通道，其中NO（+）是旋转冷的。
The predissociation dynamics of nitrous oxide ion (N(2)O(+)) at its first excited state A (2)Sigma(+) has been investigated with ion velocity imaging by probing the NO(+) fragments. The parent ion N(2)O(+), prepared at the ground state X (2)Pi(000) through (3+1) resonance-enhanced multiphoton ionization (REMPI) of jet-cooled N(2)O molecules at 360.55 nm, was excited to different vibrational levels of the A (2)Sigma(+) state in a wavelength range of 280-320 nm, and then predissociated to form NO(+) and N fragments. The internal energy distribution of the NO(+) fragment was determined from its ion velocity images. With the help of potential energy surfaces (PESs) of N(2)O(+), three dissociation pathways have been proposed to interpret the three kinds of NO(+) fragments with different internal state distributions: (1) the A (2)Sigma(+) state couples to a dissociative 1 (4)Sigma(-) state via a bound 1 (4)Pi state to form the NO(+)+N((4)S) channel, where NO(+) fragment is rotationally hot; (2) the A (2)Sigma(+) state couples to dissociative states (2)Sigma(-)/(2)Delta via the 1 (4)Pi state to form the NO(+)+N((2)D) channel, where NO(+) fragment is also rotationally hot; (3) the A (2)Sigma(+) state couples to the high energy region of the ground state X (2)Pi and then dissociates to form the NO(+)+N((2)D) channel, where NO(+) is rotationally cold.