Roton-rotation coupling of acetylene in 4He -: art. no. 250401

被引：53
|
作者：
Zillich, RE
Kwon, Y
Whaley, KB
机构：
[1] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA
[2] Konkuk Univ, Dept Phys, Seoul 143701, South Korea
来源：
PHYSICAL REVIEW LETTERS | 2004年 / 93卷 / 25期
基金：
美国国家科学基金会;
关键词：
D O I：
10.1103/PhysRevLett.93.250401
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Rotational absorption spectra of acetylene in superfluid He-4 calculated using a path-integral correlation function approach are seen to result in an anomalously large distortion constant in addition to a reduced rotational constant, with values in excellent agreement with recent experiments. Semianalytic treatment of the dynamics with a combined correlated basis function-diffusion Monte Carlo method reveals that this anomalous behavior is due to strong coupling of the higher rotational states of the molecule with the roton and maxon excitations of He-4, and the associated divergence of the He-4 density of states in this region.
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页数：4
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