Temperature-dependent far-infrared spectra of single crystals of high explosives using terahertz time-domain spectroscopy.
Survey spectra of single-crystal HMX (octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine), RDX (hexahydro-1,3,5-trinitro-1,3,5-triazine), and PETN (pentaerythritol tetranitrate) were acquired in the region from 10 to 80 cm(-1) using terahertz time-domain spectroscopy. The spectra were taken at temperatures ranging from 8.4 to 300 K. Generally, the spectra show multiple absorption peaks in the range 50-80 cm(-1), with PETN (110) showing strong absorption features at room temperature. RDX (210) is the most notable in the region 10-40 cm(-1), showing multiple spectral features, while HMX (010) shows a very broad absorption at 47.8 cm(-1) with a fwhm of 37.3 cm(-1). Future plans include polarization-dependent investigations for multiple crystallographic orientations over an increased spectral range and higher-level theoretical calculations.
Barber
Jeffrey
J
DX Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
Hooks
Daniel E
DE
Funk
David J
DJ
Averitt
Richard D
RD
Taylor
Antoinette J
AJ
Babikov
Dmitri
D
D003460:Crystallization; D013055:Spectrophotometry, Infrared / Q000379:methods*; D013696:Temperature; D013997:Time Factors