d Electron momentum densities for position annihilation in transition metals

The relative contribution of 3d electrons to the momentum densities for positron annihilation in the iron series transition metals are calculated, using the atomic Hartree-Fock-Slater orbitals. A discussion is given of the observed systematics. The per electron contribution to the angular correlations is found to decrease with the filling up of the d shell. The high momentum components are found to be relatively enhanced in case of higher Z metals. The built in spin dependence of the electron HFS wavefunction is reflected in the calculated curves.