Wavelength and concentration-dependent optical constants of NaCl, KCl, MgCl2, CaCl2, and Na2SO4 multi-component mixed-salt solutions

Wang C. C.; Tan J. Y.; Liu L. H.

摘要

The optical constants of sodium chloride (NaCl), potassium chloride (KCl), magnesium chloride (MgCl2), calcium chloride (CaCl2) and sodium sulfate (Na2SO4) solutions at weight fractions ranging from 0 to 16.6667% are measured by the combined ellipsometry-transmission method in the spectral range 0.3-1.0 mu m. In the combined method, a modified ellipsometry method is used to measure the refractive indices of liquids, and then the transmission method is conducted to obtain the extinction coefficients using the refractive indices obtained by the ellipsometry method. The experimental refractive indices of these binary solutions are utilized to obtain a molefraction weighted mixing rule, which relates the refractive index of multi-component mixed-salt solutions to the wavelength and concentration of each component. The effects of wavelength and concentration are taken into account by empirical expressions of the Lorentz -Lorenz formulized molar refraction. A mole-fraction weighted linear combined mixing rule is proposed to study the wavelength and concentration-dependent extinction coefficients of mixed-salt solutions. The optical constants of NaCl-KCl and NaCl-Na2SO4 ternary solutions, NaCl-KCl-CaCl2 quaternary solutions, and NaCl-KCl-MgCl2-CaCl2-Na2SO4 multi-component solutions are measured to verify the mixing rules. The results show that the optical constants calculated based on the mixing rules are in good agreement with experimental data, which demonstrate the feasibility of the proposed mixing rules. As the experimental analysis indicates, both the refractive indices and the extinction coefficients of the saline solutions increase with solute concentrations in the spectral range 0.3-1.0 mu m. (C) 2017 Optical Society of America

机译：通过组合椭圆形测量测量，氯化钠（NaCl），氯化钾（KCl），氯化钾（KCl），氯化镁（MgCl 2），氯化钙（CaCl 2）和硫酸钠（Na 2 SO 4）溶液的溶液中测量 - 光谱范围内的传输方法0.3-1.0μm。在组合方法中，改进的椭圆形方法用于测量液体的折射率，然后进行传输方法以使用椭圆形方法获得的折射率获得消光系数。这些二元溶液的实验折射率用于获得钼重载的混合规则，其将多组分混合盐溶液的折射率与每个组分的波长和浓度相关。通过Lorentz-orlesz配制摩尔折射的经验表达，考虑了波长和浓度的影响。提出了一种摩尔 - 级分加入线性组合混合规则，以研究混合盐溶液的波长和浓度依赖性消光系数。测量NaCl-kCl和NaCl-Na 2 SO 4三元溶液，NaCl-Kcl-CaCl2季溶液和NaCl-Kcl-MgCl2-CaCl 2-Na 2 SO 4多组分溶液的光学常数以验证混合规则。结果表明，基于混合规则计算的光学常数与实验数据吻合良好，表明了提出的混合规则的可行性。随着实验分析表明，折射率和盐酸溶液的消光系数都随着溶液浓度的0.3-1.0μmm的溶质浓度而增加。（c）2017年光学学会

Wavelength and concentration-dependent optical constants of NaCl, KCl, MgCl2, CaCl2, and Na2SO4 multi-component mixed-salt solutions

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