电子与氧分子碰撞中的偶极解离动力学
Dipolar dissociation dynamics in electron collisions with oxygen molecules
摘要：
用时间切片速度图成像技术研究了21-35 eV能量电子碰撞引起的分子氧偶极解离。初步估算了该过程的阈值，测量了碎片负离子的动能和角分布。发现偶极解离的发生是由于里德伯态通过离子对态的预解离，对于较低的入射电子能量，以及从也直接激发到离子对态相对较高的初级束能量。从动能和角分布数据分别确定了激发态的位置和对称性。
英文摘要：
The dipolar dissociation of molecular oxygen due to 21-35 eV energy electron collision has been studied using the time sliced velocity map imaging technique. A rough estimation about the threshold of the process and the kinetic energy and angular distribution of the fragment negative ions are measured. The dipolar dissociation found to be occur due to pre-dissociation of a Rydberg state via ion-pair state for lower incident electron energies as well from also direct excitation to the ion-pair states for relatively higher primary beam energy. The location and symmetry of the excited states were determined from the kinetic energy and angular distribution data respectively.
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