A COMPARATIVE-STUDY OF CLASSICAL AND SEMICLASSICAL MODELS OF THE H-NA-ASTERISK(3P) CHARGE-EXCHANGE PROCESS()

The electron capture process from Na(3p+/-1) atoms by a proton has be en studied both classically and semiclassically in the energy range fr om 1 to 10 keV. In the classical model, we have developed a three-body classical trajectory Monte Carlo (CTMC) method with both a Coulomb po tential and a model potential for the e--Na+ interaction. In the semic lassical model, an adiabatic molecular basis including an electron tra nslation factor is employed to describe the electronic wavefunction. W hen the e--Na+ interaction is described by a model potential, at large impact parameter the CTMC probabilities are in good agreement with th e semiclassical molecular probabilities at low energies and with the s emiclassical atomic probabilities at higher energies.