Multipole optical response of spherical sodium clusters: coupling of surface and volume modes

摘要

The coupling of surface and volume collective E-lambda oscillations is taken into account in the schematic random phase approximation (SRPA). This leads to a considerable improvement of description of the dipole plasmon in neutral and singly charged (Z=+1) sodium clusters. Good agreement of the SRPA results with experimental data testifies to the applicability of the separable approximation used in the SRPA residual forces. The predictions for E2 and E3 collective excitations are presented. The calculations were performed with the Kohn-Sham and Woods-Saxon single-particle schemes. New parameters for the Woods-Saxon potential are proposed. 23 refs., 4 figs., 1 tab. (Atomindex citation 28:035489)