期刊
PHYSICAL REVIEW LETTERS
卷 93, 期 25, 页码 -出版社
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.93.250401
关键词
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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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