Charge Transfer in Hartree-Fock Approximation of Time-Dependent Anderson Model

Abstract

The effect of the intraatomic Coulomb interaction on the charge transfer is treated in the Hartree-Fock approximation with use of the time-dependent Anderson model which has been widely employed in gas-surface collision without the intraatomic interaction so far. The charge state of the scattered ion from the metal surface is calculated numerically for a case of simple time-dependence in a surface-adatom interaction within the wide band approximation. The total number of electrons transferred to the adatom-orbital is found to saturate in a rather short time interval. The spin polarisation grows exponentially, dependent on the spin splitting of the adatom level. Also shown is an oscillatory behaviour of spin polarisation near its equilibrium value after the exponential growth.