Stability of a chemically bound helium compound in high-pressure solid helium
Stability of a chemically bound helium compound in high-pressure solid helium
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DOI：
10.1063/1.1506150
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发表时间：
2002-09-15
影响因子：
4.4
通讯作者：
Gerber, RB
中科院分区：
文献类型：
--
作者：
Bihary, Z;Chaban, GM;Gerber, RB
HHeF是一种化学键合的氦化合物，已被预测在气相中是亚稳态的。它通过在皮秒时间尺度内隧穿能垒而衰变为He+HF和H+He+F。本文研究了HHeF在加压固体氦中的稳定性。使用现实的潜在的HHeF/He相互作用，势能沿着的最小能量路径的分解进行评估，和隧道衰变时间计算的WKB近似。发现当压力高于500 MPa时，分解为H+He+F被完全抑制。在所研究的最高压力23 GPa下，HHeF->He+HF的时间尺度在毫秒范围内。在远高于23 GPa的压力下，HHeF因此预计将无限期地保持稳定。(C)2002年美国物理学会。
HHeF, a chemically-bound helium compound, has been predicted to be metastable in the gas phase. It decays by tunneling through energy barriers in picosecond timescales into He+HF and H+He+F. This paper studies the stability of HHeF in pressurized solid helium. Using realistic potentials for the HHeF/He interaction, the potential energy along the minimum energy paths for decomposition is evaluated, and tunneling decay times are computed by the WKB approximation. It is found that for pressures above 500 MPa, decomposition into H+He+F is completely suppressed. At 23 GPa, the highest pressure studied, the timescale for HHeF-->He+HF is in the millisecond range. At pressures well above 23 GPa, HHeF is thus expected to remain stable indefinitely. (C) 2002 American Institute of Physics.