Abstract
It is shown that the collective electron and London-Heitler models are not to be regarded as different approximations to the same exact wave function for solids in which, according to the former model, there is a partially filled zone of energy levels. It can thus be shown why nickel oxide in the pure state is a non-conductor, although it contains an incomplete zone. The properties of the metals nickel, palladium and platinum are discussed in the light of these results; platinum differs from nickel in that the orbital contribution to the moment of the elementary magnets is not quenched. A discussion is given of x-ray absorption edges, and it is shown why exciton lines are absent for metals.
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http://iopscience.iop.org.sci-hub.cc/article/10.1088/0370-1298/62/7/303/meta;jsessionid=DC4F01965F8CC745BC7748B7CEEE9505.c4.iopscience.cld.iop.org
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http://iopscience.iop.org.sci-hub.cc/article/10.1088/0370-1298/62/7/303/meta;jsessionid=DC4F01965F8CC745BC7748B7CEEE9505.c4.iopscience.cld.iop.org
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