THE MEAN WORK FUNCTION EFFECTIVE FOR POSITIVE ION EMISSION FROM POLY- AND MONOCRYSTALLINE SURFACES

Hiroyuki Kawano
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Hiroyuki Kawano: Faculty of Science, Ehime University, Matsuyama 790-8577, Japan

Surface Review and Letters (SRL), 2005, vol. 12, issue 01, 107-113

Abstract: To clarify the thermionic property of solids, the mean work function effective for positive ion from polycrystalline surfaces (ϕ+) is theoretically studied together with that for electron emission (ϕe). The theoretical values of ϕ+andϕethus evaluated typically withWare in good agreement respectively with those experimental ones accepted today. The thermionic contrast (Δϕ* ≡ ϕ+–ϕe) is determined to be 0.56–0.57eVforW. For other polycrystalline metals (Nb,Mo,Ta,Re,IrandPt), it ranges from about 0.4 to 0.8eVin contrast with monocrystalline ones having Δϕ* = 0. Consequently, the fact of Δϕ* > 0 should be taken into consideration with any polycrystalline surface, and ϕ+should be adopted whenever we try to analyze those data on positive ion emission due to any of the processes such as thermal stimulation and ion bombardment at heterogeneous surfaces. This article concludes that such typical data on thermal- and secondary-positive ion emissions are analyzed reasonably by adoption of ϕ+instead ofϕe.

Keywords: Thermionic contrast; effective mean work functions; thermal positive ion emission; secondary positive ion emission; thermal electron emission (search for similar items in EconPapers)
Date: 2005
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DOI: 10.1142/S0218625X05006858

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