Optical Constants in the Infrared for Aqueous Solutions of NaCl
Optical Constants in the Infrared for Aqueous Solutions of NaCl
复制标题
氯化钠水溶液的红外光学常数
DOI：
10.1364/josa.62.000849
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发表时间：
1972
影响因子：
--
通讯作者：
W. Nijm
中科院分区：
文献类型：
--
作者：
M. Querry;R. C. Waring;W. E. Holland;G. M. Hale;W. Nijm
测量了1M、3M和5M氯化钠水溶液在红外2-20μm区域的相对镜面反射率，测量了垂直于入射面的电矢线偏振的辐射通量分量。以蒸馏水为反射率标准。入射角为70.03°±0.23°。利用测量的相对反射率、菲涅耳方程和蒸馏水的光学常数，计算了相同偏振和入射角情况下解的绝对反射率。对绝对反射光谱和相对反射光谱分别进行了Kramers-Kronig色散分析，得到了相移光谱和相位差光谱。溶液的光学常数由通常与Kramers-Kronig分析相关的方法确定。在相位差谱中注意到表征水的溶质和红外谱带的光谱特征。
Relative specular reflectances of 1M, 3M, and 5M aqueous solutions of NaCl were measured in the 2–20-μm region of the infrared for the component of radiant flux with the electric vector linearly polarized perpendicular to the plane of incidence. Distilled water was the reflectance standard. The angle of incidence was 70.03°±0.23°. Absolute reflectances of the solutions for the same polarization and angle of incidence were computed by use of the measured relative reflectances, one of the Fresnel equations, and the optical constants of distilled water. Phase-shift and phase-difference spectra were obtained by applying a Kramers–Kronig dispersion analysis to the absolute- and relative-reflectance spectra, respectively. The optical constants of the solutions were determined by methods commonly associated with the Kramers–Kronig analysis. Spectral signatures that characterize the solute and the infrared bands of water were noted in the phase-difference spectra.