Time resolved optical spectroscopy to examine chemical decomposition of energetic materials under static high pressure and pulsed heating conditions

A new approach that permits real time (ns to μs) investigation of condensed phase chemical reactions under extreme conditions of high pressure and high temperature is presented. Time resolved absorption and emission spectroscopy has been used in conjunction with a high pressure gem anvil cell to monitor chemical changes initiated by pulsed laser heating in statically compressed samples. Absorption measurements are presented for 3,6-trinitroethylaminetetrazine samples pressurized up to 4.0 GPa. Emission measurements are presented for aluminum/water combustion at pressures to 0.8 GPa. The experimental approach is also expected to be valuable for examining temperature induced changes in statically compressed inert materials.