Excimers in the Lowest Rotational Quantum State in Liquid Helium.
Excimers in the Lowest Rotational Quantum State in Liquid Helium.
复制标题
液氦中处于最低旋转量子态的准分子。
DOI：
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发表时间：
2016
影响因子：
5.7
通讯作者：
K. von Haeften
中科院分区：
文献类型：
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作者：
L. G. Mendoza;Nagham Shiltagh;M. Watkins;N. Bonifaci;F. Aitken;K. von Haeften
氦准分子（He 2 *）在最低允许的旋转量子态的液氦的证据。He 2 * 是通过气相和正常液相中的电晕放电产生的。在3.8 ~ 5.0 K和0.2 ~ 5.6 bar的可见光区记录的荧光光谱显示了He ~（2+）的旋转分辨d3 → u ~+ → b3 → g跃迁。线位移和线强度的压力和温度依赖性的分析表明，溶剂化的He 2 * 叠加在其气相光谱的功能，并在液相中，只有压力诱导的旋转冷却。这些发现表明，He 2 * 可用于研究纳米尺度下不同相态的散装氦。
Evidence for helium excimers (He2*) in the lowest allowed rotational quantum state in liquid helium is presented. He2* was generated by a corona discharge in the gas and normal liquid phases. Fluorescence spectra recorded in the visible region between 3.8 and 5.0 K and 0.2 and 5.6 bar showed the rotationally resolved d3Σu+ → b3Πg transition of He2*. Analysis of the pressure and temperature dependence of lineshifts and line intensities showed features of solvated He2* superimposed on its gas-phase spectrum and, in the liquid phase only, pressure-induced rotational cooling. These findings suggest that He2* can be used to investigate bulk helium in different phases at the nanoscale.