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High Resolution Study on Highly Excited Rydberg H Atom Scattering with He
Wu Guorong1, Ran Qin2, Dai Dongxu1, Yang Xueming*1
1.State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023;2.Department of Chemistry and Biochemistry, University of California at Santa Barbara, CA USA, 93106
Abstract:
A high resolution study of the high-n Rydberg H atom scattering with helium was carried out using the H atom Rydberg tagging time-of-flight technique. Differential cross sections were measured for scattering process of H(n)+He→H(n′)+He at the collision energy of 0.526 eV. Experimental result indicates that the scattered H(n′) product is mainly forward distributed, with signals observed in the wide range of angles at the sideway and forward scattering directions. At the sideway and forward directions, a lot of oscillatory structures in the angular distributions are present. Detailed analysis also shows that the principle quantum number, n, is not changed much for the Rydberg H atom at the forward scattering direction. This work provides a good test ground to investigate theoretically the exact collision dynamics between the high-n Rydberg H atom and the helium atom.
Key words:  High Rydberg state, H atom, He atom, Scattering
FundProject:
高里德堡态氢原子与氦原子散射的高分辨研究
吴国荣1, 冉琴2, 戴东旭1, 杨学明*1
1.中国科学院大连化学物理研究所,分子反应动力学国家重点实验室,大连,116023;2.加州大学圣巴巴拉分校,化学与生物化学系,美国圣巴巴拉市,加州,93106
摘要:
利用了氢原子飞渡时间谱实验方法对处于高n主量子数里德堡态的氢原子与氦原子的分子束散射过程进行了高分辨研究.测量了H(n)+He→H(n′)+He 散射过程的散射微分截面.实验结果表明,产物主要分布在前向散射方向,在侧向也有一定的分布.在前向和侧向存在大量的振荡结构.同时详细的研究也表明,在上述的散射过程中往前散射的方向上,氢原子里德堡态主量子数n的变化并不是很大.实验结果得到了为理论上精确研究高n主量子数里德堡态的氢原子与氦原子的散射动力学的一套精细的实验数据.
关键词:  高里德堡态  氢原子  氦原子  散射
DOI:10.1088/1674-0068/18/6/867-871
分类号: