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thz spectra of parabens at low temperature

Science china(Information Sciences) 2012年第1期55卷 114-119页

作者： zhao guozhong,wang he,liu liming&wang xiaoyan department of physics,capital normal university,beijing key lab for thz spectroscopy and imaging,key lab of thz optoelectronics,ministry of education,beijing 100048,china 1. department of physics Capital Normal University Beijing Key Lab for THz Spectroscopy and Imaging Key Lab of THz Optoelectronics Ministry of Education Beijing 100048 China

Terahertz transmission spectra of methylparaben,ethylparaben,propyl-p-hydroxybenzoate and butyl-p-hydroxybenzoate were measured by terahertz time-domain spectroscopy(thz-TDS)at 7.8 *** it was dicult to observe the thz absorbance peaks of these esters at room temperature(294.3 K),they could be observed at 7.8 *** thz absorbance peaks of these materials were at a higher frequency at 7.8 K than that at room *** functional theory(DFT) was used to simulate the vibrational spectrum of ethylparaben to study the origin of the thz absorbance *** research provides reference data for the spectral properties of parabens and the identification of their molecular structures and vibration modes in the terahertz range.

关键词： terahertz spectroscopy low temperature parabens

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thz spectrum of reduced glutathione

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Science china(physics,Mechanics & Astronomy) 2005年第5期48卷 585-592页

作者： wang Weining1, YAN Haitao1, YUE Weiwei1, zhao guozhong1, ZHANG Cunlin1, liu Haibo2 & ZHANG Xicheng2 1. department of physics, capital normal university, beijing 100037, china 2. Center for Terahertz Research, Rensselaer Polytechnic Institute, Tory, NY, USA 1. department of physics Capital Normal Univesity 100037 Beijing China 2. Center for Terahertz Research Rensselaer Polytechnic Institute Tory NY USA

The optical characteristics of reduced glutathione molecules between 0.2 thz and 2.4 thz have been investigated by thz time-domain spectroscopy (thz-TDS). The absorption characteristics and optical parameters of the reduced glutathione purged with Nitrogen at room temperature were obtained experimentally. The measured results were fitted well with the theoretical results computed by using Density Functional Theory (DFT) in far-infrared range. Also the conformation of the reduced glutathione molecule was simulated by Gaussian 03. This work has demonstrated significantly that thz-TDS spectroscopy can further be used to study other biological molecules in biological and biomedical engineering.

关键词： thz time domain spectroscopy, reduced glutathione, absorption spectrum, biological engineering.

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