Abstract
Recent work on the effects of the screening of the electromagnetic field in small metal particles is described. A full quantum-mechanical calculation of the optical absorption of a small Na sphere, by Ekardt, is compared with a modified classical approach, and by including surface scattering quite good agreement is obtained. Ekardt's recent calculation of the photoemission cross section for the Na sphere is also compared with a calculation using the modified classical screening and square-well wavefunctions. Again the overall agreement is quite good, and an enhancement of about 10 2 in photoyield in a wide frequency range around the Mie plasmon frequency is observed. Finally, the photoemission from an Ag sphere of radius 25 au is calculated, using the bulk dielectric properties to find the screened electromagnetic field. The photoyield near threshold is only enhanced by a factor of 10 by the screening, and this is insufficient to explain the experimentally observed enhancement of photoemission from small Ag particles.
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