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Fast spectroscopy of energy release in nanometric explosives

Authors
Journal
Chemical Physics Letters
0009-2614
Publisher
Elsevier
Publication Date
Volume
368
Identifiers
DOI: 10.1016/s0009-2614(02)01846-8

Abstract

Abstract 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 ONO 2 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 ∼5 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.

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