The excited particles emission under electron bombardment of the metal surfaces covered by the alkaline films

Abstract

In this paper the electron-stimulated desorption for the excited H-atoms and molecules of OH, CO and CN has been investigated. The Cu, Ta, W and stainless steel targets were bombarded by the electron beam with the energy of 1keV and the optical radiation emitted by the desorbed excited particles was measured. It was shown that the radiation of H α, H β, H γ -lines of Balmer series under the electron bombardment of neither clean metal surfaces nor the targets covered by the adsorbed atoms of residual gas has been observed. The radiation of H α, H β, H γ -lines and molecular band of OH (306 nm) we have observed only under the electron bombardment of the metal surfaces covered by Cs. The H α-line and OH-band were arisen simultaneously when the certain Cs-coverage was reached. In this case their intensities depended on the H partial pressure. Under these conditions for the first time the radiation of CN and CO-molecules were observed when the organic compounds containing the nitrogen and air were admitted to chamber.