Photoemission Spectroscopy of Carbon Clusters

Abstract

The mechanisms and processes in a graphite hollow cathode discharge that produces carbon clusters are presented. The state of the carbon vapour within the source IS evaluated by using the characteristic line emissions from the carbonaceous discharge whose formative mechanisms depend upon the kinetic and potential sputtering of the sooted cathode. The carbonaceous discharge generated atomic and ionic carbon (C) and its clusters Cm (m>2), noble gas metastable atoms and ions, energetic electrons and photons in the cavity of graphite hollow cathode. The parameters of cluster formation depend critically on the discharge parameters, the geometry of the hollow cathode, gas pressure Pl-Ie the discharge current idis and the magnetic field. The study of the state of excitation of the neutral, singly and doubly charge monatomic carbon as a function of the discharge parameters in graphite hollow cathode source. Comparisons of the level densities of various charged states of CI and metastable levels of helium He!. The interesting and intriguing patterns of the generation and recycling mechanisms are reported with the long lived He metastable atoms