Photo-induced Electron Emission of Nanostructured Carbon Thin Film Based Transmission Photocathodes at Different Electric Field

Abstract

Very thin nanostructured carbon films were deposited on quartz substrate by reactive magnetron sputtering using graphite target and gas mixture of Ar and reactive gas N2 or N2+H2. Film thicknesses were in the range of 20–25 nm. Rutherford backscatter- ing spectrometry and Elastic recoil detection analytical method determined the concentration of elements in the films. Scanning electron microscopy scanned the sur- face morphology of carbon films. Raman spectroscopy was used for chemical structural properties determina- tion of very thin carbon films. Raman spectra intensi- ties were fitted with Gaussian peaks. The photo-induced (pulsed laser - 266 nm) electron emission properties of very thin nanostructured carbon films were investigated by the measurement of cathode bunch charge at differ- ent electric field and calculate quantum efficiency. The influence of different electric field on the photo-induced electron emission characteristics of prepared transmis- sion photocathodes are discussed.