Research of Beta-Endosulfan Based on THz Time-Domain Spectroscopy

Abstract:

THz spectral properties between 0.2-1.5THz of beta-endosulfan, one of the persistent organic pollutants (POPs), are investigated based on the THz time domain system. Part of the characteristic absorption peaks are theoretically analyzed by Dmol3 modular program. The experimental results show that the average refractive index of beta-endosulfan in the THz waveband is about 1.005 and characteristic absorption peaks exist at 0.67, 0.80, 1.03, 1.14, 1.26 and 1.46THz. The absorption peaks at 0.67THz and 1.03THz have a good match with the theoretic absorption peak positions which appear at 0.72THz and 1.07THz calculated by Dmol3. The peaks at 0.67THz and 1.03THz may be caused by the torsion in B and C direction of beta-endosulfan crystal lattice, along with the translation in A direction. Compared with the experimental results of alpha-endosulfan, it can be seen clearly that these two isomers have completely different absorption peaks. For further it indicates that terahertz time domain spectroscopy (THz-TDS) has great application value in identifying isomers.

• Periodical: Advanced Materials Research (Volumes 718-720)
• Pages: 1060-1065
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.718-720.1060
• Online since: July 2013
• Authors: Zhe Liu, Xian Li, Fei Heng Yue, Lu Feng, Jin Hui Cai, Xu Sheng Kang, Ping Jie Huang
• Keywords: Absorption Peak, Beta-Endosulfan, Dmol3, THz-TDS

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