Abstract
A variational Ansatz for the ground state of the Anderson Hamiltonian for hydrogen chemisorption is presented which becomes exact in three limiting cases and gives a very good interpolation for all values of parameters. The binding energy is calculated for three different model systems and turns out to yield more than 99.9% of the exact result for a finite metal cluster for all values of coupling strengths. The wave function is used to give criteria separating the weak-coupling regime from the strong-coupling regime.
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