Calibration of the McPherson ESCA-36 Photoelectron Spectrometer

Publisher： Society for Applied Spectroscopy

ISSN： 0003-7028

Source： Applied Spectroscopy, Vol.34, Iss.1, 1980-01, pp. : 93-94

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Abstract

The relationship for the conservation of energy in the photoelectron process is given by Eq. (1):hv = ϕ_sp + E_b + E_k (1)where hv is the proton energy, ϕ_sp the spectrometer work function, and E_b and E_k represent the binding energy and kinetic energy of the ejected electron. To measure accurately the binding energy, E_b, of an electron, it is necessary to know the instrumental work function, the energy of the exciting source, and the kinetic energy of the ejected electron. In most cases hv and ϕ_sp are accurately known. E_k is determined with an electron energy analyzer. The analyzers in common use today determine E_k by electrostatic or magnetic dispersion. The McPherson ESCA-36 uses a spherical section, nonretarding potential electrostatic analyzer for which the following relation holds when relativistic effects are neglected:E_k = KeV (2)where K = 2r/dIn the above equation V is the potential difference between the spheres, K is instrument constant, r the mean radius of the spheres, e the electron charge, and d the sphere separation.