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- W2381871191 abstract "In this paper,what we want to obtain is the frequency-dependent absorption spectrum and the refractive index of thiabendazole in the terahertz wave range and then to verify the possibility and feasibility to use the terahertz wave for detecting the pesticide residues.It is just for this purpose that we were trying to apply the THz-TDS technique to measuring thiabendazole terahertz time-dominant signals in the room temperature of 294 K and 4.0% of the ambient humidity conditions.Based on the fast Fourier transform ( FFT),we have gained the amplitude and phase of thiabendazole with the reference to the frequency domain,we worked out the frequency-dependent absorption spectrum and the refractive index in the frequency range of 0.2-2.5 THz by using the model based on the Fresnel equations Terahertz time-domain spectroscopy (THz-TDS),which is a newly developed promising spectroscopy technique.The results of the experiments we have done prove that as compared with the reference signal,it is obvious to notice the time delay and the amplitude reduction of the thiabendazole signals.Such a result would let us find the five obvious characteristic absorption peaks in the absorption spectrum with the average index of refraction being 1.50.With the increase of frequency,the refractive index tends to decline slowly.Meanwhile,it is possible for us to use the density functional theory (DFT) to obtain the vibration frequencies of the thiabendazole in the THz range. Thus,our analysis has made it possible to prove that these distinct experimental absorption peaks are likely to originate from the low-frequency molecular collective vibration modes and intra-molecular crook and torsion.And,therefore,the absorption spectra in the THz region prove to be highly sensitive to the overall structure and configuration of the molecules.In addition,the above said peaks can provide a direct trace-mark of the molecule and the THz-TDS can be made a promising method for the study of the low-frequency molecular spectra and the material identification,which is likely to be feasible to detect the pesticide residues by using THz-TDS technology,a novel technology that can be used in agriculture and food industry." @default.
- W2381871191 created "2016-06-24" @default.
- W2381871191 creator A5063943033 @default.
- W2381871191 date "2011-01-01" @default.
- W2381871191 modified "2023-09-24" @default.
- W2381871191 title "Terahertz time-domain spectroscopic investigation of thiabendazole" @default.
- W2381871191 hasPublicationYear "2011" @default.
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