CHARGE AND ENERGY EXCHANGE BETWEEN A METAL AND A 2-LEVEL PARTICLE IN A METASTABLE STATE

The interaction with a metal of a two-level particle having two electrons in the triplet configuration has been studied using a time-dependent Newns-Anderson Hamiltonian under the assumption that the intra-atomic Coulomb repulsion terms are large compared to the matrix elements of the metal-particle interaction potential. Using perturbation theory explicit expressions of the transitions amplitudes for the processing occurring to second order in the interaction potential have been derived, thus allowing for the calculation of the spectral function up to fourth order. Results for a model system are presented that emphasize the importance of correlation terms in the various processes.