Sa. Blundell et C. Guet, NONLOCAL ION POTENTIAL EFFECTS ON THE OPTICAL-RESPONSE OF LITHIUM CLUSTERS, Zeitschrift fur Physik. D, Atoms, molecules and clusters, 33(2), 1995, pp. 153-161
We present a spherical symmetry model, containing explicitly nonlocal
effects in the electron-ion interaction, to describe the electronic pr
operties of lithium clusters. We assume either an optimized discrete i
onic structure or a jellium structure. The model provides the nonlocal
potential from which the random phase approximation with exact exchan
ge is applied to calculate the optical response of Li clusters. The op
tical response of Li-139(+) obtained within this model is in good agre
ement with the measured giant dipole resonance. The same model is used
to predict alkali-metal effective masses; the agreement with band str
ucture calculations is emphasized.