Intense evaporation of a group of particles with allowance for thermal and ionization nonequilibrium in a radiation field

The intense evaporation in vacuum of a group of monodisperse metal particles in the CW radiation field of a CO2 laser is investigated theoretically in the quasi-stationary approximation. An approach is proposed whereby the many-particle problem is solved in the one-particle approximation, with the presence of a group of particles taken into account by introducing a vapor concentration growing with time at infinity. A two-temperature vapor plasma is assumed, and allowance is made for ionization nonequilibrium. The evolution of the vapor parameters is investigated. The breakdown times and the collective breakdown threshold are determined for different particle concentrations.