Observation of the Molecular Helium Negative Ion He - 2
Observation of the Molecular Helium Negative Ion He - 2
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氦分子负离子He-2的观察
DOI：
10.1103/physrevlett.52.747
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发表时间：
1984
影响因子：
8.6
通讯作者：
J. R. Peterson
中科院分区：
文献类型：
--
作者：
Y. Bae;M. Coggiola;J. R. Peterson
首次观测到了长寿命亚稳态He/sub2//sup-/负离子。它们是由He/sub2//sup+/在Cs蒸汽靶中通过两步电子俘获产生的。在形成后的几个延迟时间测量了表观自脱衰减率，表明存在不止一个态，主要成分的寿命超过100µ...S。最可能的配置是/sup 4/..sigma../subg//sup+/和/或/sup 4/pi/subg/绑定在He/sub2/(/sup 3/..sigma../subu//sup+/)下面的状态。
Long-lived metastable He/sub 2//sup -/ negative ions have been observed for the first time. They were produced from He/sub 2//sup +/ by two-step electron capture in a Cs vapor target. The apparent autodetachment decay rates have been measured at several delay times after formation, and indicate the presence of more than one state, with the lifetime of the major component exceeding 100 ..mu..s. The most likely configurations are /sup 4/..sigma../sub g//sup +/ and/or /sup 4/Pi/sub g/ states bound below He/sub 2/( /sup 3/..sigma../sub u//sup +/).