Study of the laser-induced decomposition of energetic materials at static high-pressure by time-resolved absorption spectroscopy

18th APS-SCCM; 24th AIRAPT

Hébert, P.^1 ; Saint-Amans, C.^1

CEA, DAM, Le Ripault, Monts

F-37260, France^1

关键词: Carbonaceous products;    Combustion fronts;    Decomposition products;    Diamond-anvil cell;    Laser-induced decomposition;    One-step reactions;    Time-resolved absorption;    Two-step mechanisms;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/500/2/022002/pdf
DOI  :  10.1088/1742-6596/500/2/022002

来源: IOP

【 摘 要 】

The reactivity of laser-initiated energetic materials has been studied at high-pressure using time-resolved absorption spectroscopy in a diamond anvil cell (DAC). The results obtained for nitromethane (NM) are presented in this paper. A change in reactivity is clearly seen around 25 GPa. Below this pressure, a one-step reaction is found to occur. The decomposition products formed behind the combustion front are essentially carbon residues as shown by Raman spectroscopy. At higher pressure, a two-step mechanism is observed. The first step, which is similar to the reaction observed below 25 GPa, leads to the formation of carbonaceous products. It is followed by a slower step which leads to the formation of a transparent amorphous product. This product remains stable in the DAC after reaction.