Laser-Induced Decomposition of 2,2',4,4',6,6'-Hexanitrostillbene at 263, 527 and 1053 nm

Abstract

Investigation on laser-induced decomposition will provide important information for a better understanding of detonation mechanism of energetic materials. The effects of laser irradiation on 2,2',4,4',6,6'-hexanitrostillbene at different laser wavelengths has been studied by XPS and FT-IR. Results showed photodecomposition mechanism of 2,2',4,4',6,6'-hexanitrostillbene is wavelength-dependent. In case of 263 and 527 nm irradiated, the nitro-nitrite isomerization and the fragmentation of trans-C=C bond are the main decomposition steps, while in the case of 1053 nm, only the fragmentation of trans-C=C bond was observed.

Observation of Excited νs(NO2) and Relaxation Process of HNS in Solution by CARS Technique

“…While in a mixed crystal sample, the low frequency continuum is composed of the well-defined acoustic and optical phonons of the crystal. The fragmentation of HNS at irradiation of 1024 nm may result from this particular energy transfer from initially excited vibration to low frequency phonons in solid sample [8]. The smaller and colder hot spot created by long-wavelength infrared radiation may also provide evidence for this explanation [7].…”

“…Recently, smaller and colder hot spot has been created by longwavelength infrared radiation (28)(29)(30), providing direct evidence in violation of "hot spot" via fast nonradiative transition of excited states [7]. In addition, the fragmentation of 2,2 ,4,4 ,6,6 -hexanitrostillbene (HNS, Fig.1) has been observed at irradiation of long wavelength of 1024 nm [8]. The phenomena make researchers rethink about how the initiation energy couples into molecules.…”

Study on the Photolysis Route of Nano 2,2ʹ,4,4ʹ,6,6ʹ–Hexanitrostillbene by Vibrational Spectroscopy

“…These results indicated that one of the photolysis mechanisms of nano HNS may be the removal of -NO-after the isomerization of -NO 2 to -ONO (Photolysis mechanism I in Fig. 5) [34].…”