CLASSICAL TRAJECTORY AND ADIABATIC CHANNEL STUDY OF THE TRANSITION FROM ADIABATIC TO SUDDEN CAPTURE DYNAMICS .1. ION-DIPOLE CAPTURE

Classical trajectory calculations of ion-permanent+induced dipole capt ure processes are performed over very wide ranges of conditions. The r esults are represented in a simple, two-parametric analytical form of high precision. The transition from adiabatic to nonadiabatic dynamics is expressed in terms of the Massey parameter. In the adiabatic range , perfect agreement (better than 0.4%) of the derived thermal capture rate constants from classical trajectories and results from accurate s tatistical adiabatic channel (SACM) calculations is obtained. (C) 1996 American Institute of Physics.