光谱学与光谱分析, 2013, 33 (7): 1771, 网络出版: 2013-09-30  

大气气溶胶中NO-3的光学特性研究

Optical Properties Research of NH4NO3 by Fourier Transform Infrared Spectroscopy
作者单位
中国科学院安徽光学精密机械研究所环境光学中心, 环境光学与技术重点实验室, 安徽 合肥230031
摘要
利用傅里叶变换红外光谱技术分析比较了大气气溶胶和NH4NO3的红外光谱, 结果显示大气气溶胶和NH4NO3中的NO-3的红外光谱特征基本保持一致。 通过NH4NO3中NO-3的透过率的大小计算出了NO-3的吸收系数α和质量吸收截面κ, 利用所得吸收系数进一步求出了其复折射率的虚部, 经过K-K(Kramers-Kroning)关系的转换, 求得其复折射率的实部, 实验结果对分析大气气溶胶中各化学组分的散射和吸收效应有着极其重要的意义。
Abstract
In the present paper, the infrared spectrum of aerosol and NH4NO3 was analysed and compared, and the result showed that the infrared spectral features of aerosol are consistent with that of NH4NO3. The absorption coefficient α and the mass absorption cross section κ of NO-3 was calculated by the transmissivity of NO-3 in NH4NO3 according to Beer-Lambert law. Then the imaginary part of the complex refractive index was calculated through α. The real part of the complex refractive index was derived from the K-K(Kramers-Kroning)relationship. It has important significance for further research on the scattering and absorption characteristics of the different composition of the atmospheric aerosol through analysing the results of the experiment.

刘娜, 魏秀丽, 高闽光, 徐亮, 童晶晶, 李相贤, 金岭. 大气气溶胶中NO-3的光学特性研究[J]. 光谱学与光谱分析, 2013, 33(7): 1771. LIU Na, WEI Xiu-li, GAO Min-guang, XU Liang, TONG Jing-jing, LI Xiang-xian, JIN Ling. Optical Properties Research of NH4NO3 by Fourier Transform Infrared Spectroscopy[J]. Spectroscopy and Spectral Analysis, 2013, 33(7): 1771.

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