在OH $^+$ + Ar碰撞中通过二元相遇过程形成阴离子和阳离子：离解激发的作用和统计方面
Formation of anions and cations via a binary-encounter process in OH$^+$ + Ar collisions: the role of dissociative excitation and statistical aspects
摘要：
实验研究了7 keV OH $^+$ + Ar碰撞中分子碎裂导致的带正负电荷的氢离子的形成。最引人注目的发现是，负和正氢离子发射非常相似的角度依赖性。此外，H $^+$碎片的动能分布显示出与排出的H $^-$离子的动能分布的强相似性。发射的H核的运动学被发现基本上是由其在原子靶上的散射驱动的。然而，除了这个二进制遇到的过程中，解离电子激发的分子抛射体被调用来解释所观察到的碎片模式。虽然电子捕获过程是复杂的，它表明，不同的最终电荷态的传出碎片的相对人口可以描述由简单的统计规律。
英文摘要：
Molecular fragmentation leading to the formation of negatively and positively charged hydrogen ions in 7-keV OH$^+$ + Ar collisions is investigated experimentally. The most striking finding is that negative and positive hydrogen ions are emitted with very similar angular dependences. Also, the kinetic energy distribution of the H$^+$ fragment shows strong similarities with that of the ejected H$^-$ ion. The kinematics of the emitted H core is found to be essentially driven by its scattering on the atomic target. However, in addition to this binary-encounter process, dissociative electronic excitation of the molecular projectile has to be invoked to explain the observed fragmentation patterns. Though the electron capture process is complex, it is shown that the relative population of the different final charge states of the outgoing fragments can be described by simple statistical laws.
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