Unusual Rydberg system consisting of a positively charged helium nanodroplet with an orbiting electron.
Unusual Rydberg system consisting of a positively charged helium nanodroplet with an orbiting electron.
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不寻常的里德伯系统由带正电的氦纳米液滴和轨道电子组成。
DOI：
10.1103/physrevlett.106.083401
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发表时间：
2011
影响因子：
8.6
通讯作者：
M. Drabbels
中科院分区：
文献类型：
--
作者：
E. Loginov;M. Drabbels
有证据表明，一种不寻常的里德伯系统由含有带正电的钠离子和轨道电子的氦纳米液滴组成。发现该系统的主量子数 n<20 的里德伯态在纳秒时间尺度上不稳定。相比之下，n≳100 的里德堡态的寿命为 1.1 μs。此外，还发现钠掺杂氦的电离阈值相对于自由原子的电离阈值变宽并发生红移。使用系统的伪双原子描述成功地再现了这些观察结果，其中钠及其离子与氦的相互作用被计算为电势对之和。
Evidence is presented of an unusual Rydberg system consisting of a helium nanodroplet containing a positively charged sodium ion and an orbiting electron. Rydberg states of this system with principal quantum number n<20 are found to be unstable on a nanosecond time scale. In contrast, Rydberg states with n≳100 are found to have a lifetime of 1.1 μs. In addition, it is found that the ionization threshold of sodium-doped helium is broadened and redshifted with respect to that of the free atom. These observations are successfully reproduced using a pseudodiatomic description of the system in which the interactions of the sodium and its ion with the helium are calculated as the sum of pair potentials.