Oxygen on a cylindrical tungsten polycrystal

Using low-energy (0–25 eV) threshold electron spectroscopy and contact potential difference in vacuum not worse than 2 $\times$ 10$^{-8}$ Pa, oxygen films obtained at 295, 325–1425 (in steps of 50), and 1575 K, including in subsequent heating from the adsorption temperature to 1925 $\pm$ 50 K, on the cylindrical surface of a gas-phase tungsten coating 30 $\mu$m thick on NbC-1 alloy (Nb – 1% Zr), used as a collector material for thermal emission in space-borne nuclear power plants, have been studied.