The chemisorption energy and charge transfer of a transition-metal adatom of the 5d series on a tungsten substrate are calculated using a degenerate three-atom Hubbard Hamiltonian which is solved by making an ansatz for the wavefunction. The observed experimental trend in the chemisorption energy is reproduced for large values of the intra-atomic Coulomb interaction U, thus emphasizing the importance of correlation in this problem.
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J.P. Muscat (1975) studied this question.
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