COHERENT DYNAMIC STRUCTURE FACTOR OF LIQUID LITHIUM BY INELASTIC X-RAY SCATTERING
COHERENT DYNAMIC STRUCTURE FACTOR OF LIQUID LITHIUM BY INELASTIC X-RAY SCATTERING
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非弹性 X 射线散射研究液态锂的相干动态结构因子
DOI：
10.1103/physrevlett.78.1715
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发表时间：
1997
影响因子：
8.6
通讯作者：
E. Burkel
中科院分区：
文献类型：
--
作者：
H. Sinn;F. Sette;U. Bergmann;C. Halcoussis;M. Krisch;R. Verbeni;E. Burkel
我们提出了动量转移 $0.36\ensuremath{\le}Q\ensuremath{\le}5{\AA{}}^{\ensuremath{-}1}$ 时液态锂相干动态结构因子 $S(Q,\ensuremath{\omega})$ 的高分辨率非弹性 X 射线散射测量。确定的 $S(Q,\ensuremath{\omega})$ 与使用中性赝原子势而不是空核势的分子动力学模拟吻合得更好。我们观察到声速的正色散，证实在液态锂中，纵向动力学在高频下达到类似固体的响应。
We present high resolution inelastic x-ray scattering measurements of the coherent dynamic structure factor $S(Q,\ensuremath{\omega})$ of liquid lithium at momentum transfers $0.36\ensuremath{\le}Q\ensuremath{\le}5{\AA{}}^{\ensuremath{-}1}$. The determined $S(Q,\ensuremath{\omega})$ agrees much better with molecular dynamic simulations using the neutral pseudo-atom potential rather than the empty core potential. We observe a positive dispersion in the sound velocity confirming that in liquid lithium the longitudinal dynamics reaches a solid-like response at high frequencies.