Kinetics of luminescence induced by sputtering metallic cadmium by a pulsed fast electron beam in helium |
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Authors: | A I Miskevich and Liu Tao |
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Institution: | 1.National Research Nuclear University “Moscow Engineering Physics Institute,”,Moscow,Russia |
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Abstract: | Results of an experimental study of the kinetics of luminescence observed when a metallic cadmium foil is bombarded in a helium
medium by a 3-ns pulsed beam of 150-keV fast electrons are reported. The foil was irradiated at gas pressures from 76 to 2280
Torr. At a foil temperature of T = 240° C, the de-excitation time of the Beitler levels of the Cd II ion was measured as a function of the buffer gas pressure
and the constant of collision quenching of the 5s22D5/2 level of Cd II by He atoms was determined as k ≈ 3 × 10-29 cm6/s. The experimental data were compared with calculations performed for the gas—vapor mixture in order to find the fraction
of excited Cd II ions in the 5s22D5/2 state produced directly as a result of sputtering of metallic cadmium by high-energy electrons and by components of the helium
plasma. At a helium buffer gas pressure of P ≤ 2.5 atm and a temperature of the cadmium target of T = 240° C, the value of this quantity was found to be α = 0.28 + 0.23P (where P is the helium pressure in atmospheres). |
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