低温下红外区域中HNO₃/H₂O和H₂SO₄/HNO₃/H₂O的光学常数。

Optical constants of HNO3/H2O and H2SO4/HNO3/H2O at low temperatures in the infrared region.

作者信息

Lund Myhre C E, Grothe H, Gola A A, Nielsen C J

机构信息

Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, N-0372 Oslo, Norway.

出版信息

J Phys Chem A. 2005 Aug 18;109(32):7166-71. doi: 10.1021/jp0508406.

DOI:10.1021/jp0508406

PMID:16834080

Abstract

The complex index of refraction of liquid HNO3/H2O and H2SO4/HNO3/H2O has been obtained at different temperatures and acid concentrations. FT-IR specular reflectance spectra were obtained for 30, 54, and 64 wt % aqueous HNO3 and for four different H2SO4/HNO3/H2O mixtures in the temperature region from 293 to 183 K. The complex index of refraction was obtained from the reflectance spectra with the Kramers-Kronig transformation. The optical constants of the binary and ternary mixtures vary with the acid concentration and the temperature. The results demonstrate that vibrational bands originating from the sulfate species are more sensitive to changes in temperature than the bands originating from vibrations in the nitrate species; only minor changes in the nitrate vibrational bands are observed as the temperature decreases below 248 K.

摘要

已在不同温度和酸浓度下获得了液态HNO₃/H₂O以及H₂SO₄/HNO₃/H₂O的复折射率。在293至183K的温度范围内，获得了30wt%、54wt%和64wt%的硝酸水溶液以及四种不同H₂SO₄/HNO₃/H₂O混合物的傅里叶变换红外镜面反射光谱。通过克喇末-克朗尼格变换从反射光谱中获得复折射率。二元和三元混合物的光学常数随酸浓度和温度而变化。结果表明，源自硫酸根物种的振动带比源自硝酸根物种振动的带对温度变化更敏感；当温度降至248K以下时，仅观察到硝酸根振动带的微小变化。