Session 1P1 - Poster Session I.
POSTER session, Monday afternoon, July 21
Broadway Room, Doubletree Lloyd Center
The investigation of topography dynamics for heavy metal azides (HMA) explosive glow, using modern experimental techniques of subnanosecond time resolution is reported.
An enlarged image of silver azide whisker was transmitted by optical objective to photoelectric cathode of streak-camera. Spatial resolution was 50 \mum. Initiation was performed by a laser pulse. The sample glow under initiation near threshold of explosive decomposition is localized at separate luminous points. It should be emphasized that we concerned with predetonation luminescence at the density of energy \sim 5 mJ/cm^2. When the density of excitation energy is elevated to 150 mJ/cm^2 homogeneous glow in a sweep is observed.
We propose that these areas have increased local concentration of structure defects, e.g. areas near dislocations. The results presented elsewhere give an evidence for the above assumption: HMA slow decomposition in electric and magnetic fields occurs near dislocations, theoretical calculations predict appreciable constriction of band gap near dislocations for high explosives.