Excited-state positronium formation from helium, argon, and xenon.
Excited-state positronium formation from helium, argon, and xenon.
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由氦、氩和氙形成激发态正电子素。
DOI：
10.1103/physrevlett.102.133202
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发表时间：
2009
影响因子：
8.6
通讯作者：
G. Laricchia
中科院分区：
文献类型：
--
作者：
D. Murtagh;D. Cooke;G. Laricchia
在正电子与He， Ar和Xe原子碰撞时，正电子在2P态形成的横截面已经通过测量残余离子与正电子的Lyman-alpha光子之间的一致性来确定。这些元素对总Ps地层截面的最大贡献分数从He的约0.06+/-0.01增加到Ar的0.12+/-0.04和Xe的0.26+/-0.09。在He的情况下，发现与耦合状态计算有很好的一致性；对于Ar和Xe，测量结果与畸变波玻恩近似进行了比较。
The cross sections for the formation of positronium in the 2P state in collisions of positrons with He, Ar, and Xe atoms have been determined by measuring coincidences between the remnant ion and the Lyman-alpha photon from positronium. The maximum fractional contributions of these to the total Ps formation cross sections increase from approximately 0.06+/-0.01 in He to 0.12+/-0.04 in Ar and 0.26+/-0.09 in Xe. In the case of He, good agreement is found with a coupled-state calculation; for Ar and Xe, measurements are compared with a distorted-wave Born approximation.