Abstract
Optical emission spectra obtained from electron-bombarded KCl:Tl and KBR:Tl crystals are reported. The spectra consist of sharp lines and broad bands. The broad bands are due to the characteristic Tl + emission. The sharp lines coincide in energy with emission lines from electronic transitions of isolated neutral potassium atoms. The production of the excited state potassium atoms was found to depend on the incident beam current. A linear dependence was found in the low current region, a third power dependence for intermediate currents, and greater than third power dependence for high currents.
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