Author： Velenik A. Živković T. de Jeu W.H. Murrell J.N.
Publisher： Taylor & Francis Ltd
ISSN： 1362-3028
Source： Molecular Physics, Vol.18, Iss.5, 1970-05, pp. : 693-696
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Abstract
It is shown that the energy associated with the Fermi-contact part of the hamiltonian of the hydrogen atom cannot be expanded as a perturbation series. A variation calculation shows that the total energy is E 0 when the Fermi-contact operation is added to H 0 , and -∞ when it is subtracted. In order to do a priori variational calculations on the ‘second-order' properties of this operator, such as spin-spin coupling constants, it is probably necessary to remove the singularity caused by the δ function.
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