Laser detonation source

The scattering dynamics experiments done in our laboratory utilize the coupling of a laser detonation source (described above) with a crossed molecular beams apparatus (Fig. 0). 42-144 pulsed beam containing energetic species (oxygen atoms or inert species, such as Ar and N2) is... 

This conclusion was tested with a practical experiment in which the erosion yield of polystyrene under exposure to the effusive plasma source was measured with and without the addition of the pulsed hyperthermal Ar beam. In this experiment, the Ar beam pulse was not chopped, so the entire beam pulse produced from the laser detonation source was allowed to strike the surface. The erosion yield was determined by placing a screen over the samples during exposure and measuring the etch depth... 

Fig. 6. Schematic diagram of the laser-detonation hyperthermal beam source, the dififerentially pumped scattering region containing the target surface, and the rotatable mass spectrometer detector.

The preparation and immediate use of manganese(III) azide species generated slowly in situ by refluxing manganese(III) acetate and sodium azide in acetic acid in presence of alkene reaction substrates to prepare 1,2-diazidoalkanes avoids the need to isolate manganese(III) azide which has a high probability of explosive instability [1]. The (II) azide is known [20260-90-6], isolable, detonable and has been patented as a power source for lasers [2],... 

Various further experiments with laser radiation as an ignition and initiation source have been conducted since the seventies. For example, for the ignition of propellants, various pyrotechnic mixtures and metastable intermolecular composites (MICs), the effects of the laser wavelength, gas pressure or dopants on the initiation thresholds, the development of laser initiated detonators, as well as a... 

Many methods have been reported for production of nanodiamonds (NDs) such as laser ablation, " plasma-assisted chemical vapor deposition," autoclave synthesis from supercritical fluids, ion irradiation of graphite, chlorination of carbides, electron irradiation of carbon onions, and ultrasound cavitation. Smaller NDs can be prepared by detonation processes that yield aggregates of NDs with sizes of 4-5 nm embedded in a detonation soot composed of other carbon allotropes and impurities. An explosive mixture having an overall negative oxygen balance provides a source of both carbon and energy for the conversion. Because of their small size (2-10 nm) detonation NDs have also been referred to as ultradispersed, nanocrystalline... 

BNCP and its analogs are sensitive to light and may be detonated by laser pulses. Initial studies [43] report use of a variety of laser sources at 800 and 1,060 nm, with later activities, studying the sensitivity of pressed powders to a single pulse, using solid state neodymium laser (1,060 nm, 1.5 J, 2 ms, beam diameter 1 mm) [44]. BNCP analogs are evaluated as alternatives to substances such as hydrazino tetrazole mercury(II) perchlorate which is probably the most sensitive substance with respect to laser pulses (initiation time around 30 ns at 1.10 " J) [39]. 

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