Centre de Recherche, d'Innovation et de Transfert Technologique en Jet Fluide, 2 Avenue de la Grande Terre 55000 Bar-le-Duc, France.
J Chem Phys. 2012 Mar 28;136(12):124201. doi: 10.1063/1.3698481.
The refractive index of water is precisely determined in the visible light range as a function of the pressure until 250 MPa by means of a new measurement device that uses a special pipe tee included in an interferometer set. This technique allows revisiting the Bradley-Tait and Sellmeier equations to make them dependent on the wavelength and the pressure, respectively. The Bradley-Tait equation for the pressure dependence of the water refractive index is completed by a wavelength-dependent factor. Also, in the considered pressure and wavelength ranges, it is shown that the Sellmeier coefficients can be straightforwardly linked to the pressure, allowing the determination of the refractive index of water for either any wavelength or pressure. A new simple model allows the determination of the density of water as a function of the measured refractive index. Finally, the polarizability of water as function of pressure and wavelength is calculated by means of the Lorentz-Lorenz equation.
水的折射率在可见光范围内通过一种新的测量设备，利用干涉仪组中包含的特殊管三通，精确确定直至 250 MPa 的压力下的折射率。该技术允许重新审视 Bradley-Tait 和 Sellmeier 方程，分别使它们依赖于波长和压力。Bradley-Tait 方程用于水折射率的压力依赖性，由一个依赖于波长的因子完成。此外，在所考虑的压力和波长范围内，表明 Sellmeier 系数可以直接与压力相关联，允许确定任何波长或压力下水的折射率。一个新的简单模型允许根据测量的折射率确定水的密度。最后，通过 Lorentz-Lorenz 方程计算压力和波长下水的极化率。
