Critical parameters of a micro-hotspot model of the laser-pulse initiation of the explosive decomposition of energetic materials

The work continues a series of studies of the micro-hotspot model a thermal explosion. The dependences of the critical energy fluence and the temperature of the reaction kernel in pentaerythritol tetranitrate (PETN) on the radius of aluminum nanoparticles at half-maximum pulse durations of 10 to 150 ns are calculated. For each pulse duration, there is an optimal nanoparticle radius at which the critical energy fluence is minimal. The dependences of these parameters on the pulse duration are derived. It is shown that there is a universal relationship, independent of the pulse duration, between the normalized critical energy fluence and the nanoparticle radius.