抄録
Several phenomena caused by electron bombardment for barium oxide films deposited from oxide coated cathode are described. Oxide cathode used as electron source is largely deactivated by electron bombardment applied for deposited film. Origin of emission decay is found to be ascribed to evolved gas from deposited film under bombardment.
Furthermore, details of change of deposited film’s activity under bombardment are described. Emission of film increases or decreases by electron bombardment due to whether deposition is carried out at low or at high cathode temperature. Change of work function is also measured. In connection with the electron bombardment, temperature effect for films are studied and an activation or a deactivation phenomenon was found. These results obtained for nickel and molybdenum sleeves are applicable for the case of grid emission in commercial tubes.
