effect of induced dipole-induced dipole potential and the size of colliding particles on ion-quadrupolar molecule collision rate constants

classical trajectory (monte carlo) calculation is used to calculate collision rate constants of ion-quadrupolar molecule interactions for the h¯+c2h2 system. the method presented here takes into account the effect of the induced dipole-induced dipole potential on ion-quadrupolar molecule collision rate constants. it is also assumed that the colliding particles have a definite size. the thermal energy collision rate constants are calculated at 300-3000 k temperature range and the kinetic energy dependence of rate constants is examined at a relative kinetic energy of the colliding particles in the range from thermal energy up to ~1.3 ev. it is suggested that the induced dipole-induced dipole potential term and the particles size are important factors and should not be ignored when calculating collision rate constants of ion-quadrupolar molecule system.