SURFACE IONIZATION OF LITHIUM, LITHIUM FLUORIDE, AND THALLIUM ON VARIOUS METALLIC SURFACES.
Special technical progress rept. no. 1,
COLORADO UNIV BOULDER
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The efficiency of surface ionization of beams of thallium and lithium fluoride on surfaces of W, Ir, Pt, Rh, Ta, Nb, Re, Pd, Ni, and Mo was experimentally investigated using molecular beam techniques. Maximum efficiency and comparative signal-to-noise ratios were obtained for the first seven listed above, Efficiency as a function of detector temperature was determined for a few of these. The time dependent behavior of the ionization of L and LiF on W was investigated in some detail. In a very narrow range of temperatures the equilibrium efficiency of LiF on W is greater than 90 while that of Li on W is 25.3. Both efficiencies were obtained with the W at 1080 K. Evidence from this data is used to support the deduction of a simple model of the kinetic chemisorption processes presumed to be involved in the time dependent behavior. Author