Fast spectroscopy of energy release in nanometric explosives

作者：Wang SF; Yang YQ; Sun ZY; Dlott DD^*

来源：Chemical Physics Letters, 2003, 368(1-2): 189-194.

DOI：10.1016/S0009-2614(02)01846-8

A nanometric explosive containing 50-200 nm diameter Al particles and a nitrocellulose (NC) oxidizer is studied by high repetition rate picosecond laser ignition combined with time-resolved emission spectroscopy and coherent anti-Stokes Raman spectroscopy (CARS) of ONO2 stretching of the oxidizer. When the Al aggregates are flash-heated to the boiling point, 2740 K, nitro groups of the oxidizer near each hot aggregate are consumed within 500 ps. A burst of emission that indicates energy release occurs in similar to5 ns. The ignition delay is in the range of 500 ps to 3 ns. The rate-limiting step for energy release at Al-NC hot spots is vibrational relaxation of hot oxidized Al species.

• 出版日期2003-1-14