基于太赫兹透射光谱的乙醇水溶液Debye模型研究  

Terahertz transmission spectroscopy of Debye relaxation in ethanol/water mixtures

作　　者：李作祥[1] 张放[1] 杨霏[2] LI Zuo-xiang ZHANG Fang YANG Fei(Guiyang Vocational and Technical College,Guiyang 550081 China Guizhou Institute of Metrology,Guiyang, 55003 China)

机构地区：[1]贵阳职业技术学院,贵州贵阳550081 [2]贵州省计量测试院,贵州贵阳550003

出　　处：《分子科学学报》2017年第4期347-352,共6页Journal of Molecular Science

基　　金：国家自然科学基金青年基金资助项目(21503045)

摘　　要：利用太赫兹透射光谱测量了液态乙醇和液态水以及不同浓度乙醇水溶液在22℃的介电常数.并利用Levenberg-Marquardt算法拟合得到了它们的Debye模型,该模型包含3个弛豫过程和1个分子间伸缩振动模式.其中,慢速弛豫模式的强度(弛豫时间20~160ps)贡献了主要的介电强度,中间弛豫模式与其密切相关.而快速弛豫模式(弛豫时间约为1ps)只占了大约5%的介电常数.We have measured the complex dielectric spectra of liquid ethanol and water,and their mixtures at 22 ℃ for different volume fractions of ethanol by terahertz transmission spectroscopy.The corresponding Debye models are obtained by fitting the complex dielectric spectra based on the Levenberg-Marquardt algorithm,which are comprised of an intermolecular stretching vibration and three relaxation process including slow relaxation,intermediate process,fast relaxation.The strength of the slow relaxation mode（relaxation time 20~160ps）is the most prominent to the dielectric strength,and the intermediate relaxation mode is closely related to it.The fast relaxation（about 1ps）has approximately 5% of the total dielectric strength.

关 键 词：DEBYE 太赫兹 水溶液 氢键 介电常数 

分 类 号：O641[理学—物理化学]