横模对密度涨落动力学的贡献
Contribution of transverse modes to the dynamics of density fluctuations
摘要：
通过计算机模拟计算了液态和非晶态钠的横向和纵向电流关联函数。研究相应的光谱作为波矢量$k$的函数，可以评估其峰位的色散曲线。将结果与最近的实验结果[PNAS 107，21985（2010）]进行比较，所述实验结果通过在液体和多晶钠中通过非弹性X射线散射测量的$S(k,ω)$的新分析获得。实验结果与计算机模拟结果基本一致，线宽的分析支持了振动-渡越理论描述液体中的动力学过程。
英文摘要：
The transverse and longitudinal current correlation functions are evaluated in liquid and amorphous sodium by computer simulation. The study of the corresponding spectra as a function of the wavevector $k$ allows the evaluation of a dispersion curve for their peak position. The results are compared with recent experimental findings [PNAS 107, 21985 (2010)], obtained by a new analysis of $S(k,ω)$ measured by inelastic X-ray scattering in liquid and polycrystalline sodium. A substantial agreement between experimental and computer simulation results is found. The analysis of the line widths supports the Vibration-Transit theory picture of the dynamics in liquids.
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