Back Flux for Pulsed Laser Evaporation into Vacuum

This paper proposes results on calculation of the back flux for the case of pulsed laser evaporation into vacuum. On the basis of the direct Monte Carlo simulation, one-dimensional plane expansion of vapor cloud was calculated for a wide range of the number of evaporated monolayers. A substantial back flux rise is observed if the rotational degrees of freedom are taken into account. Influence of relaxation collision number on the back flux is demonstrated. Computations that combine the laser-induced target heating calculation and the direct Monte Carlo simulation of vapor cloud expansion show an insignificant effect of the time evolution of the surface temperature on the back flux.