FORMULA FOR MAXIMUM SECONDARY ELECTRON YIELD FROM METALS

Ai-Gen Xie, Ling Wang and Liu-Hua Mu
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Ai-Gen Xie: School of Physics and Optoelectronic Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, P. R. China
Ling Wang: School of Physics and Optoelectronic Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, P. R. China
Liu-Hua Mu: School of Physics and Optoelectronic Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, P. R. China

Surface Review and Letters (SRL), 2015, vol. 22, issue 02, 1-9

Abstract: Based on free-electron model, the calculated inelastic mean escape depth of secondary electrons, experimental one, the energy band of metal, the characteristics and processes of secondary electron emission, maximum number of secondary electrons released per primary electronδ(Φ,EF)PEmas a function of parameterKm, work functionΦand Fermi energyEFwas deduced, whereKmis a constant for a given metal in the energy range 100–800 eV. According to the relationship between maximum secondary electron yield from metalδ(Φ,EF)mandδ(Φ,EF)PEm, the formula forδ(Φ,EF)mas a function of atomic number Z, parameterKm,ΦandEFwas deduced. Using the deduced formula forδ(Φ,EF)m, Z, experimentalδ(Φ,EF)m,ΦandEF,Kmrelative to alkali metals,Kmrelative to earth-alkali metals and the mean value ofKmwere computed, respectively. And the formulae for maximum secondary electron yield from alkali metals, earth-alkali metals and metals were obtained and proved to be true, respectively. On the basis of the deduced formula forδ(Φ,EF)mand the empirical relation that highΦare connected with highEF, it can be concluded that highδ(Φ,EF)mare connected with highΦand vice versa.

Keywords: Maximum secondary electron yield; work function; Fermi energy; metal; 81.90.+c; 79.20.Hx; 79.20.Ap (search for similar items in EconPapers)
Date: 2015
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DOI: 10.1142/S0218625X15500195

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