Photoemission from oblate silver spheroids with polarized vacuum UV excitation

A 3 nm thick silver film was evaporated on a quartz slide and then heated for 60 s at 400 C. The resulting spheroids were 60 nm in diameter with average center-to-center distance of 110 nm. These particles were flattened out along the substrate normal with a typical ratio of minor axis length to major axis length being 0.2. Photoemission measurements were made using a Seya-Namioka monochromator with an air discharge lamp. The dependence of the photo yield on the polarization of the incident light was determined with a VUV transmission polarizer made of cleaved LiF plates.