Nonequilibrium velocity distribution and reaction rate in ionndash;molecule reactions

摘要

The nonequilibrium velocity distribution and reaction rate in fast ionndash;molecule reactions with nonhyphen;Langevin reaction cross sections are studied using the Monte Carlo simulation in steadyhyphen;state systems where ions are diluted in heathyphen;bath reactant molecules and ion sources compensate the loss of ions due to the reaction. The nonhyphen;Langevin reaction cross sections are taken as the power and exponential dependences on the collision energy and the elastic cross section is taken as the hardhyphen;sphere model. The ion velocity distribution and temperature and the reaction rate constant indicate significant deviations from equilibrium.