Detection of electrons in the surface ionization of H Rydberg atoms and H 2 Rydberg molecules
Detection of electrons in the surface ionization of H Rydberg atoms and H 2 Rydberg molecules
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H 里德伯原子和 H 2 里德伯分子表面电离中电子的检测
DOI：
10.1088/0953-4075/45/1/015204
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
McCormack E
中科院分区：
文献类型：
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作者：
McCormack E
首次实验研究了金属表面里德堡氢原子与分子相互作用中的电子探测问题。在里德堡原子或分子预计与表面碰撞的时间门中对电子信号的实验检测为先前提出的背散射电子损失提供了证据(So等人，2009年物理。A 79 012901版)，作为电子提取场下表面电离的一种途径。离子和电子引出结果的比较表明，在两种情况下，里德堡态接近表面时的动力学非常不同，导致最初制备的里德堡态中的电子极化可能失去对里德堡轨迹中能级交叉的控制。在Rydberg H和H2情况下观察到的电离动力学的差异也说明了原子和分子、类氢和非类氢体系之间的一些根本区别。
The detection of electrons from the surface interaction of Rydberg hydrogen atoms and molecules at a metal surface is investigated experimentally for the first time. The experimental detection of an electron signal in a time gate corresponding to when the Rydberg atoms or molecules are expected to collide with the surface provides evidence for the previously proposed backscattered electron loss (So et al 2009 Phys. Rev. A 79 012901) as a route of surface ionization under electron-extraction fields. Comparison of the ion-and electron-extraction results shows that the dynamics as the Rydberg states approach the surface are very different in the two cases, leading to the possible loss of control of the electronic polarization in the initially prepared Rydberg state from the traversal of level crossings during the Rydberg trajectory. The difference in the ionization dynamics observed for the Rydberg H and H 2 cases also illustrates some of the fundamental differences between atomic and molecular, and hydrogenic and non-hydrogenic systems.