Abstract
AbstractIn order to analyse the effect of many‐particle excitations on the indirect interaction between nuclear or ionic spins the fourth order contribution to the ground state energy is calculated. This contribution appears to be divergent. This is due to the fact that the contributions of the disconnected diagrams and the irregular part of the fourth order operator do not cancel each other, which is a consequence of the commutator properties of angular momentum operators. It is therefore concluded that the derivation of the R.K.K.Y. interaction on the basis of Rayleigh‐Schrödinger perturbation theory is of doubtful validity.
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