Photo-dissociation of Co2 Gas by Using Two Lasers

The objective of ab initio calculations of photo-dissociation of molecules is to determine the optimized laser parameters so that the desired free radicals (CO, CH2, ...) and conditions can be produced. These free radicals and conditions may facilitate the formation of diamond or diamond-like thin films. In order to efficiently produce the desired free radicals, one needs to either choose appropriate laser frequency (one-laser-dissociation case) or involve a proper intermediate state (multi-laser-dissociation case). In this paper, we use an ab initio model of two-laser dissociation of CO2 molecules to show the influences of different combinations of laser parameters (laser intensity, laser pulse duration, and time lag between two laser pulses) on the population of free radicals. The optimized laser parameters will be used as reference parameters in the experiments.