太赫兹谱定量测试中朗伯比尔定律表征形式分析

doi:10.3964/j.issn.1000-0593(2013)12-3180-07

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摘要：探讨了朗伯比尔定律在太赫兹谱段的应用，研究了单一氨基酸压片样品(谷氨酰胺)和两种氨基酸混合压片(苏氨酸和胱氨酸)在不同浓度情况下对朗伯比尔定律的适用程度。分析了吸光度和吸收系数在描述物质的太赫兹光学特性的区别。通过对比单一组分在1.72 THz附近的吸收系数值和吸光度值，验证物质对太赫兹波在两种吸收表征量下吸收随浓度变化的情况，利用拟合优度的R²指标研究了各表征量下物质太赫兹吸收与浓度的线性关系的好坏;分析两组分混合物在0.3～2.6 THz有效谱段的两种吸收表征量的太赫兹吸收情况，利用相似性系数和估计浓度误差作为评价指标，明确了在太赫兹谱定量测试中应采用吸光度的加和性而非吸收系数的加和性，进一步明确朗伯比尔定律在太赫兹波段的应用。

关键词：氨基酸;太赫兹;吸收系数;吸光度;加和性

Abstract：The present paper discusses the Lambert-Beer’s law application in the terahertz spectrum, studies the single amino acid tablet sample (glutamine) and two kinds of amino acids mixture tablet (threonine and cystine) under the condition of different concentrations. Absorbance and absorption coefficient was analyzed in the description of the terahertz optical properties of matter. By comparing absorption coefficient and absorbance value of the single component in the vicinity of 1.72 THz, we verified the material under two kinds of absorption characterization of quantity of THz wave absorption along with the change in the concentration. Using the index of goodness of fit R², it studied the stand or fall of linear relationship between the terahertz absorption quantity of material and concentration under two kinds of representation. This paper analyzes the two components mixture under two kinds of absorption characterization of quantity of terahertz absorption in 0.3～2.6 THz. Using the similarity coefficient and the estimate concentration error as evaluation index, it has been clear that the absorbance of additivity instead of the absorption coefficient should be used during the terahertz spectrum quantitative test, and the Lambert-Beer’s law application in the terahertz wave band was further clarified.

Key words：Amino acid;Terahertz;Absorption coefficient;Absorbance;Additivity

收稿日期: 2013-08-15 修订日期: 2013-10-15

中图分类号:

O433.5+1

通讯作者: 赵小燕 E-mail: zhaoxiaoyan@ustb.edu.cn

引用本文:

苏海霞, 张朝晖, 赵小燕^*, 李智, 燕芳, 张寒 . 太赫兹谱定量测试中朗伯比尔定律表征形式分析 [J]. 光谱学与光谱分析, 2013, 33(12): 3180-3186.
SU Hai-xia, ZHANG Zhao-hui, ZHAO Xiao-yan^*, LI Zhi, YAN Fang, ZHANG Han . The Lambert-Beer’s Law Characterization of Formal Analysis in Terahertz Spectrum Quantitative Testing. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2013, 33(12): 3180-3186.

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