ADSORPTION AND DESORPTION OF N-2 ON NI(110) - ENTROPY VERSUS ENERGY

Experimental data on N-2 on Ni(110), taken some 16 years ago, are re-a nalyzed in view of new results on the external vibrations of N-2 on Ni (110) obtained by inelastic helium scattering. On the basis of a three -state lattice gas model we can explain in a self-consistent manner th e equilibrium data for the coverage dependent isosteric heat and entro py, as well as the thermal desorption data. Although thought to be a s imple model for weak chemisorption, the N-2 on Ni(110) system exhibits intriguing and complex compensation effects between the energetic and entropic driving forces.