吡虫啉和代森锰锌的太赫兹光谱研究

为了解吡虫啉和代森锰锌两种农药在太赫兹波段的光谱特性,采用太赫兹时域光谱(THz-TDS)技术测量了室温下吡虫啉和代森锰锌在0.2-2.0 THz的高分辨率吸收谱和折射率谱.结果表明两种农药样品在此波段都有明显的特征吸收峰,且吸收谱存在显著差异.两种样品的平均折射率分别为1.65和1.32,随着频率的增加,吡虫啉的折射率增大,而代森锰锌的折射率减少.太赫兹时域光谱(THz-TDS)技术可以鉴别不同种的农药分子,这对进一步利用该技术检测农药残留有重要的意义.

Terahertz spectroscopic investigation of Imidacloprid and Mancozeb

In order to understand the spectroscopic characteristics of two pesticides (imidacloprid and mancozeb) in the terahertz region, Terahertz time-domain spectroscopy (THz-TDS) was used to measure the absorption coefficient and refractive index in the frequency range 0.2 -2.0THz at room temperature. The results indicate that imidacloprid and mancozeb have distinct absorption features, which have the large differences in such frequency range. The average refraction indices of two pesticides (imidacloprid and mancozeb) are 1.65 and 1.32. With frequency increasing, the refractive index of imidacloprid increases and that of mancozeb declines. THz-TDS can be used to distinguish different kinds of pesticides, which is significant for the measurement of pesticide residues..