Spectrum of intensity of electrons transmitted and detected by a spectrometer with a dispersing energy analyser as a function of energy,
\(E\).
Notes: - In retarding field energy analysers, which do not have a dispersing element, the direct spectrum can be obtained from the first differential of the collected current with respect to the retarding energy.
- By convention, direct spectra in X-ray photoelectron spectroscopy are often presented in constant analyser energy mode, in which the spectrum approximates the true spectrum, whereas, in Auger electron spectroscopy, spectra are often presented in constant retardation ratio mode, in which the spectrum approximates to \(E\) times the true spectrum.
Source:
PAC, 2020, 92, 1781. 'Glossary of methods and terms used in surface chemical analysis (IUPAC Recommendations 2020)' on page 1823 (https://doi.org/10.1515/pac-2019-0404)