The effect of attractive lateral interactions on flash-desorption spectra

We will discuss the effect of attractive lateral interactions on flash-desorption spectra for molecular and dissociatively adsorbed species. Attractive interactions lead to characteristic coverage dependent variations in the shape and in the temperature maximum of desorption peaks which are quite distinct from desorption traces without lateral interactions. These variations are modelled for first and second order desorption kinetics with and without precursor states. As an example for attractive lateral interactions we will present flash-desorption results of moleculary adsorbed N2 on a Ni(110) surface