Faculty Publications

Title

Measurement of the positron work functions of polycrystalline Fe, Mo, Ni, Pt, Ti, and V

Document Type

Article

Journal/Book/Conference Title

Physical Review B

Volume

44

Issue

22

First Page

12166

Last Page

12171

Abstract

We report measurements of the positron work functions + of polycrystalline samples of Fe, Mo, Ni, Pt, Ti, and V. The positron work functions were obtained by measuring the energy spectrum of slow positrons reemitted by the metal surfaces when bombarded with keV-energy positrons. Two methods were used to extract the work functions. The first method provides an absolute measurement. The second method infers the positron work function from measurements of =++- (where + and - are the positron and electron chemical potentials, respectively) relative to the value of for Cu and to the values of the electron work function for the surface. The second method (which circumvents many of the systematic problems of the first method since the values of are independent of crystal face and surface contamination) gives Fe+=-1.2(2) eV, MO+=-2.2(2) eV, Ni+=-1.2(2) eV, Pt+=-1.8(2) eV, V+=-0.6(2) eV, and Ti+>0. Our results are compared to theoretical predictions and to previous measurements. © 1991 The American Physical Society.

Original Publication Date

1-1-1991

DOI of published version

10.1103/PhysRevB.44.12166

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