VH light scattering from triphenyl phosphite: Coupling of shear modes to molecular rotation
VH light scattering from triphenyl phosphite: Coupling of shear modes to molecular rotation
复制标题
亚磷酸三苯酯的 VH 光散射：剪切模式与分子旋转的耦合
DOI：
10.1080/00268977500100021
复制
发表时间：
1975
期刊：
影响因子：
--
通讯作者：
D. Kivelson
中科院分区：
文献类型：
--
作者：
S. Tsay;D. Kivelson
研究了液体亚磷酸三苯酯（TPP）在温度范围内的光散射光谱，参数（k 2η/Γoρ）在0·17 ~ 50之间变化，其中k为散射矢量，η为剪切粘度，ρ为质量密度，Γ0为由HH谱确定的旋转相关频率。在这个温度范围内，VH光谱的特征发生了显著变化，可以用分子旋转耦合到剪切模式来解释。需要一个依赖于时变相关函数的单一耦合参数来拟合频谱；该参数(R)约等于0·45，与温度和k无关。光谱是参数（k 2η/Γ0ρ）的函数，该参数包括粘度、温度和散射角的变化。提出了一种统计理论，它产生了不同于先前得到的谱的显式表达式；在较大的（k 2η/Γ0ρ）值时，差异是本质的。剪切粘度系数…
The light-scattering spectrum of liquid triphenyl phosphite (TPP) has been studied over a temperature range in which the parameter (k 2η/Γoρ) varies from 0·17 to 50, where k is the scattering vector, η the shear viscosity, ρ the mass density and Γ0 the rotational correlation frequency determined from the HH spectrum. The VH spectrum changes markedly in character over this temperature range and can be explained in terms of molecular rotations coupled to shear modes. A single coupling parameter, dependent upon a time-dependent correlation function, is required to fit the spectrum; this parameter (R) is about equal to 0·45 and is independent of temperature and of k. The spectrum is a function of the parameter (k 2η/Γ0ρ) which includes variations with viscosity, temperature and scattering angle. A statistical theory is presented which yields a different explicit expression for the spectrum from that obtained previously; the difference is essential at large values of (k 2η/Γ0ρ). The coefficient of shear viscos...