Explosion initiation energy threshold of silver azide was studied for different laser radiation wavelengths. Samples were prepared in the form of pellets (pressed powders), thread-like monocrystals and thin plate polycrystals. A special laser complex was used to perform the experiments. It provided multiparameter measuring of different processes in explosive decomposition of samples. These processes are glowing of decomposing sample, glowing from the irradiated area only, sample acoustic response, shape and energy of a laser pulse. The time resolution for all the experiments made 5 ns and synchronization accuracy made 10 ns. It was found that silver azide demonstrates high sensitivity to laser radiation in its transparent spectral region (1064 nm and 532 nm). The explosion initiation energy threshold made 4-8 mJ/cm 2 for both pressed powders with the free surface and for samples with the covered and pressed by a quartz plate surface. Silver azide crystals require approximately 10 times higher energy density to explode. When the samples were acted by UV laser radiation, their sensitivity was from 50 to 500 times lower for the uncovered samples. The covered and pressed samples demonstrated the sensitivity which was close to that for acted by 1064 nm laser radiation. Equal sensitivity of samples to laser radiation with different wavelengths testifies to non-photochemical nature of explosion initiation. The results obtained in the experiments can be consistently explained within the limits of the thermal theory of explosion initiation.
|Журнал||Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms|
|Состояние||Опубликовано - 1 сен 2012|
ASJC Scopus subject areas
- Nuclear and High Energy Physics