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Evolution of the optical properties of alkali-metal microclusters towards the bulk: The matrix random-phase-approximation description

Physical Review B, ISSN: 0163-1829, Vol: 47, Issue: 15, Page: 9849-9861
1993
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Article Description

The evolution toward the bulk values of the energy centroid and of the width characterizing the surface-plasmon resonance in spherical neutral sodium clusters is studied. For this purpose, the photoabsorption spectrum of clusters comprising from 8 to 338 atoms is calculated microscopically making use of the jellium shell model to describe the motion of delocalized electrons and of the matrix random-phase approximation to determine the collective response of the system to electromagnetic radiation. The Coulomb force is treated in the local-density approximation. The case of large potassium clusters having approximately 500 and 900 atoms is also considered. © 1993 The American Physical Society.

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