Advanced Quantum-Kinetic Model of Energy Exchange in Atmospheric Molecules Mixtures and CO2 Laser-Molecule Interaction

Abstract

AbstractWe present an advanced quantum-kinetic model for describing nonlinear optical effects due to the interaction of infrared laser radiation with the atmospheric molecules mixture (with accounting for the nonlinear radiation transfer and possible chemical conversion mechanisms too). An obvious consequence of the resonant interaction (in particular, absorption) of electromagnetic radiation by atmospheric molecules mixture is a quantitative redistribution of molecules over the energy levels of the internal degrees of freedom, which quantitatively changes a gas absorption coefficient. A change in the population levels of the gas mixture causes a violation of the thermodynamic equilibrium between the vibrations of the molecules and their translational motion and causes a nonlinear effect of the kinetic cooling of the atmospheric environment. The calculational data on a temporal dependence of the relative resonant absorption coefficient for rectangular, Gauss and soliton-like laser pulses are presented and analysed. It is clear that the time dependence of the relative resonance absorption coefficient of laser radiation by CO2 molecules differs for different laser pulses. The condition of realization of an atmospheric environment kinetic cooling is obtained and compared with available estimates.KeywordsQuantum kinetic modelMolecules in electromagnetic fieldAtmospheric molecules mixturesGas absorption coefficient