Far-infrared spectroscopic characterization of explosives for security applications using broadband terahertz time-domain spectroscopy

被引：102

作者：

Fan, W. H. ^{[1
]}

Burnett, A. ^{[1
]}

Upadhya, P. C. ^{[1
]}

Cunningham, J. ^{[1
]}

Linfield, E. H. ^{[1
]}

Davies, A. G. ^{[1
]}

机构：

[1] Univ Leeds, Sch Elect & Elect Engn, Leeds LS2 9JT, W Yorkshire, England

来源：

APPLIED SPECTROSCOPY | 2007年 / 61卷 / 06期

基金：

英国工程与自然科学研究理事会;

关键词：

broadband; terahertz time-domain spectroscopy; explosive; temperature dependence; far infrared; vibrational; TEMPERATURE-DEPENDENCE; VIBRATIONAL-SPECTRA; ENERGETIC MATERIALS; NUCLEOSIDES; MODES;

D O I：

10.1366/000370207781269701

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

Broadband terahertz time-domain spectroscopy (THz-TDS) has been used to measure the far-infrared (FIR) vibrational spectra of several commonly used pure explosives, including 2,4,6-trinitrotoluene (TNT), 1,3,5-trinitroperhydro-1,3,5-triazine (RDX), 1,3-dinitrato-2,2-bis(nitratomethyl)propane (PETN), and two types of plastic explosive, SEMTEX and SX2. A number of distinct absorption peaks, originating from FIR-active vibrational modes of these polycrystalline energetic materials, were observed in the frequency range 0.3-7.5 THz (10-250 cm(-1)). In addition, the temperature-dependent FIR vibrational spectra of PETN were measured between 4 K and 296 K with several well-resolved absorption peaks observed across this temperature range. We find that as the temperature is reduced, the observed absorption peaks resolve into narrower features and shift towards higher frequencies. The temperature dependence of the spectra is explained in terms of the anharmonicity of the vibrational potentials of crystalline compounds, and an empirical fit is given to describe the peak shift with temperature.

引用

页码：638 / 643

页数：6

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