99-12U

We present generalized transfer equations for the consistent description of electron kinetic and atomic diffusion processes in a system "metal-adsorbat-gas-tip". These equations were obtained with the use of the method of nonequilibrium statistical operator by D.N.Zubarev. We also obtain the kinetic equation for a one-electron density matrix as well as generalized diffusion equations for adsorbed and not adsorbed gas atoms on a metal surface. These equations are analysed for both strongly and weakly nonequilibrium processes.