Quantum rotational fluctuation of a linear molecule doped in superfluid helium clusters
Quantum rotational fluctuation of a linear molecule doped in superfluid helium clusters
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DOI：
10.1088/0953-8984/20/49/494205
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发表时间：
2008-11
期刊：
影响因子：
--
通讯作者：
S. Miura
中科院分区：
文献类型：
--
作者：
S. Miura
采用路径积分混合蒙特卡罗方法，研究了氦-4团簇中OCS分子的量子转动涨落与团簇大小N的函数关系，2≤N≤。在中等尺寸区域(10≤N≤20)，掺杂剂的分子旋转表现出非单调的尺寸依赖关系，反映了超流动性的开始和分子周围氦密度的重新配置。对于较大尺寸的区域N≥2 0，在取向涨落和相关的有效转动常数中发现了振荡的N依赖关系。通过与玻耳兹曼对应的尺寸依赖关系的比较，证明了该振荡是由团簇中玻色统计的影响引起的。
Using a path integral hybrid Monte Carlo method, the author examines quantum rotational fluctuation of an OCS molecule in helium-4 clusters as a function of cluster size N: a small-to-large size regime, 2≤N≤64. The molecular rotation of the dopant is found to show non-monotonic size dependence in the medium size regime, 10≤N≤20, reflecting the onset of the superfluidity and the reconfiguration of the helium density around the molecule. For larger size regime, N≥20, oscillatory N dependence in the orientational fluctuation and the associated effective rotational constant is found. The oscillation is demonstrated to arise from the effect of the Bose statistics in the cluster by comparing the size dependence with the Boltzmann counterpart.