CHARGE-TRANSFER IN DIET FROM PHYSISORBATES ON METAL-SURFACES

Using results of electron and photon stimulated desorption for physiso rbed rare gases and molecular hydrogen on Ru(001), the importance of v ertical and lateral charge transfer processes between the adsorbate an d the substrate, and between adparticles, respectively, is illustrated . It is shown that commonly DIET of physisorbates cannot be described within the framework of only one mechanism, and that particularly for stimulated desorption of molecules the asymptotic nature of their elec tronic excitations as well as the energetic correlation with the occup ied and unoccupied density of states of the substrate are important.