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The photoelectric work function of monolayer films of uranium on polycrystalline tungsten

1967; Elsevier BV; Volume: 8; Issue: 4 Linguagem: Inglês

10.1016/0039-6028(67)90048-9

1879-2758

C. H. Lea, C. H. B. Mee,

Gyrotron and Vacuum Electronics Research

Abstract Films of uranium of up to a few monolayers in thickness were evaporated on to polycrystalline tungsten substrates at pressures not higher than 2 × 10 −10 Torr. The photo-electric work function of the films as a function of coverage was determined using the Fowler technique: the work function at monolayer coverage was found to be 3.65 ± 0.01 eV for a film at room temperature. Between about 940°K and 1040°K (i.e. in the temperature range in which β-uranium is stable) the work function was 3.59 ± 0.01 eV, and above 1060°K (above the β-γ phase transition) the work function was 3.45 ± 0.01 eV.