Quantum stochastic modeling energy transfer and effect of rotational and V-T relaxation on multiphoton exitation and dissociation of CF3Br molecules

摘要

A stochastic kinetic approach was used to calculate the integral parameters of the multiphoton excitation (dissociation) and relaxation of molecules CF3Br in the buffer gas (N-2). A process of excitation into continuum is described within the generalized kinetical equations model to account for stochastization of the vibrational motion. The multiphoton dissociation yield and absorbed energy for molecules of (CF3Br)-C-12 and (CF3Br)-C-13 were calculated. A dependence of the absorbed energy and dissociation yield on pressure p = p(N-2) + p(CF3Br) were determined for a number of lines of the CO2 laser (1048.66, 1043.16, 1035.47 cm(-1)). It is shown that the dissociation yield is mainly defined by the influence of the rotational relaxation in the pressure interval p < 50-100 Torr and here the V-T relaxation is not significant. Above 200 Torr the dissociation yield was determined by the concurrence of two processes: the V-T relaxation and process of involving the molecules from the lowest levels. (c) 2005 Wiley Periodicals, Inc.