THz spectra of parabens at low temperature  

作　　者：ZHAO GuoZhong WANG He LIU LiMing WANG XiaoYan 

机构地区：[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

出　　处：《Science China(Information Sciences)》2012年第1期114-119,共6页中国科学（信息科学）（英文版）

基　　金：supported by National Natural Science Foundation of China(Grant Nos.50971094,10474067);Natural Science Foundation of Beijing(Grant No.1092007);National Keystone Basic Research Program(Grant No.2007CB310408)

摘　　要：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 K. While it was difficult to observe the THz absorbance peaks of these esters at room temperature （294.3 K）, they could be observed at 7.8 K, The THz absorbance peaks of these materials were at a higher frequency at 7.8 K than that at room temperature. Density functional theory （DFT） was used to simulate the vibrational spectrum of ethylparaben to study the origin of the THz absorbanee peaks. This research provides reference data for the spectral properties of parabens and the identification of their molecular structures and vibration modes in the terahertz range.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 K. While it was difficult to observe the THz absorbance peaks of these esters at room temperature （294.3 K）, they could be observed at 7.8 K, The THz absorbance peaks of these materials were at a higher frequency at 7.8 K than that at room temperature. Density functional theory （DFT） was used to simulate the vibrational spectrum of ethylparaben to study the origin of the THz absorbanee peaks. This 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 

分 类 号：O434.3[机械工程—光学工程] O625.523[理学—光学]