Temperature dependence of collective modes in liquid sodium
Temperature dependence of collective modes in liquid sodium
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DOI：
10.1016/s0022-3093(99)00218-5
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发表时间：
1999-08-01
影响因子：
3.5
通讯作者：
Burkel, E
中科院分区：
文献类型：
--
作者：
Pilgrim, WC;Hosokawa, S;Burkel, E
给出了由非弹性X射线散射实验得到的纯相干液态钠的动态结构因子的结果。在388~1173K的四个温度下进行了测量，得到了每个温度下液体中纵向集体激发的色散关系。结果表明，与体积值相比，绝热声速作为色散斜率在较低的Q值下增大。即使在实验中达到的最高温度下，这种“正弥散”仍然存在。根据实验数据，给出了实验温度范围内液体剪切模数的估计值。(C)1999 Elsevier B.V.保留所有权利。
We present results for the purely coherent dynamic structure factor of liquid sodium obtained from inelastic X-ray scattering experiments. Measurements were carried out at four temperatures between 388 and 1173 K. The dispersion relations for longitudinal collective excitations in the liquid could be determined for each temperature. It is found that the adiabatic sound velocity given as the slope of the dispersion at lower Q is increased compared to the bulk value. This 'positive dispersion' still exists even at the highest temperatures attained in this experiment. From the data an estimate is given for the shear modulus of the liquid along the temperature range covered by our experiment. (C) 1999 Elsevier B.V. All rights reserved.