Surface Ionization of Niobium
Authors:
- 15 May 1965
- journal article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 42 (10) , 3645-3648
Abstract
By measuring the temperature dependence of Nb+ emission from a niobium surface heated between 1990° and 2175°K; a value of 10.39±0.15 eV was obtained for the heat of ion vaporization. The work function for the niobium surface was found to be 3.90±0.05 eV in the 1850°-to-2025°K temperature range. The method used for this determination consisted of a mass-spectrometric measurement of the ratio of positive to negative ions formed when a constant-intensity beam of alkali halide molecules impinged upon the niobium surface. These quantities, together with the ionization potential of niobium are sufficient to derive a value of 7.45 eV for the heat of niobium sublimation at absolute zero. This is in excellent agreement with previous direct determinations of this quantity.Keywords
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