Transverse Acoustic Excitations in Liquid Ga
Transverse Acoustic Excitations in Liquid Ga
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DOI：
10.1103/physrevlett.102.105502
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发表时间：
2009-03-13
影响因子：
8.6
通讯作者：
Baron, A. Q. R.
中科院分区：
文献类型：
--
作者：
Hosokawa, S.;Inui, M.;Baron, A. Q. R.
在9 nm(-1)以上的Q值范围内，用非弹性x射线散射探测到了液体Ga中的横向声激发模，尽管液体Ga多为硬球状液体。从头算分子动力学模拟显然支持这一发现。通过对统计质量较好的S(Q，omega)谱的详细分析，可以估算出横向声子模的寿命为0.5ps，传播长度为0.4-0.5 nm，这可能与液态Ga中瞬时形成的笼子的寿命和大小相对应。
The transverse acoustic excitation modes were detected by inelastic x-ray scattering in liquid Ga in the Q range above 9 nm(-1) although liquid Ga is mostly described by a hard-sphere liquid. An ab initio molecular dynamics simulation clearly supports this finding. From the detailed analysis for the S(Q,omega) spectra with a good statistic quality, the lifetime of 0.5 ps and the propagating length of 0.4-0.5 nm can be estimated for the transverse acoustic phonon modes, which may correspond to the lifetime and size of cages formed instantaneously in liquid Ga.