Density fluctuations in liquid rubidium. I. Neutron-scattering measurements
Density fluctuations in liquid rubidium. I. Neutron-scattering measurements
复制标题
液体铷的密度波动。
DOI：
10.1103/physreva.9.1656
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发表时间：
1974
影响因子：
2.9
通讯作者：
J. M. Rowe
中科院分区：
文献类型：
--
作者：
J. Copley;J. M. Rowe
我们报道了在315 K下，在波矢1.25≤ Q≤ 5.5 <$− 1范围内，液体铷的相干散射函数S（Q，ω）的中子散射测量结果。在这个范围内，没有证据表明在常数Q处绘制的S（Q，ω）中的有限ω处有峰。另一方面，傅里叶变换F（Q，t）表现出结构，特别是对于Q= 2.0 Ω-1，这表明液体中至少有两个特征（依赖于波长的）弛豫时间。对于大于3.0 Ω − 1的波矢量，F（Q，t）可以用单个弛豫时间来表征。这些结果，连同我们在Q< 1.0 <$− 1时的结果，提供了与液态模型和分子动力学计算进行详细比较的可能性。
We report neutron-scattering measurements of the coherent scattering function S (Q, ω) of liquid rubidium at 315 K, in the range of wave vectors 1.25≤ Q≤ 5.5 Å− 1. In this range there is no evidence of peaks at finite ω in S (Q, ω) plotted at constant Q. On the other hand the Fourier transform F (Q, t) exhibits structure, notably for Q= 2.0 Å− 1, which indicates at least two characteristic (wavelength-dependent) relaxation times in the liquid. For wave vectors> 3.0 Å− 1, F (Q, t) may be characterized by a single relaxation time. These results, in conjunction with our results for Q< 1.0 Å− 1, offer the possibility of detailed comparisons with models of the liquid state and with molecular-dynamics calculations.