INVESTIGATION OF THE CHARACTERISTICS OF OF PETN AND RDX CRYSTALS EXPLOSIVE DECOMPOSITION

Abstract

The measurements of the emission spectra of single RDX crystals in the predetonation mode when irradiated with an electron beam pulse (0.25 MeV, 20 ns, 40 J/cm2) at the temperatures of 80 K and 300 K are reported. At 300 K, a very narrow emission band with a maximum at 380 nm was revealed. With decreasing of the sample temperature to a shift in the maximum emission band form 380 nm at 300 K to 370 nm at 80 K was found.The temperature dependence on the exciton luminescence bands of RDX in the predetonation mode was measured. An increase in the luminescence intensity with decreasing temperature of the sample at the wavelength of 370 nm was detected. At the wavelength of 460 nm, the temperature dependence of the luminescence intensity was not found.When using the second harmonic of Nd: YAG laser (532 nm, 10 ns, 0.8 J), the possibility of initiating an explosion of PETN polycrystalline was revealed. The dependence of explosion probability on the energy density of the initiating pulse was measured. The critical energy density corresponding to 50 % probability PETN explosion is Hcr = 12.3 J/cm2. The authors assume that at samples initiation by the second harmonic of the laser, ionization of PETN molecules may go by the mechanism of two-photon absorption. The subsequent processes of explosive decomposition, apparently, proceed similarly as in the case of electron-beam exposure.

Keywords

• e-beam
• rdx
• petn
• laser
• explosion
• two-photon absorption