Momentum vector correlation maps for three-particle fragmentation of neutral triatomic hydrogen near its ionization threshold
Momentum vector correlation maps for three-particle fragmentation of neutral triatomic hydrogen near its ionization threshold
复制标题
中性三原子氢在电离阈值附近三粒子破碎的动量矢量相关图
DOI：
--
复制
发表时间：
2010
期刊：
影响因子：
--
通讯作者：
H. Helm
中科院分区：
文献类型：
--
作者：
P. C. Fechner;H. Helm
在电离阈值附近，H{sub 3}的高里德堡态的三粒子解离由外电场诱导。我们观察到的动量矢量相关图的质心运动的碎片迅速改变与电子能量。出现了作为近线性几何特征的碎片取向的接近阈值和高于阈值的实质性贡献，即，两个动量相反的原子，第三个原子几乎静止。这一发现与Strasser等人[Phys.Rev.A66，032719（2002）]的观察结果相似，后者研究了冷H{sub 3}{sup +}离子与慢电子的解离复合。我们讨论了可能的解离路径负责所观察到的相关性。
Three-particle dissociation of high-lying Rydberg states of H{sub 3}, in the immediate vicinity of the ionization threshold, is induced by an external electric field. We observe that the momentum vector correlation map of the center-of-mass motion of the fragments changes rapidly with electronic energy. Near- and above-threshold substantial contributions of fragment orientations which are characteristic of near-linear geometry appear, i.e., two atoms with opposing momenta, the third atom being nearly at rest. This finding is similar to observations by Strasser et al. [Phys. Rev. A 66, 032719 (2002)], who studied dissociative recombination of cold H{sub 3}{sup +} ions with slow electrons. We discuss the likely dissociation paths responsible for the observed correlation.