Natural FWHM
Natural FWHM of Element (spin-orbit) ???
Total FWHM = (FWHMx-ray2 + FWHMhemi-sphere broadening2 + FWHMelement2Â )1/2
Energy (Wavelength) Spreads
FWHMx-ray spread                     0.16 – 0.21 eVÂ
FWHM (Lorentzian)
Shape of X-ray Energy Distribution ( λ) is 100% Lorentzian
Shape of Emitted Photo-Electron Energy Distribution is 100% Lorentzian
(?? eV)
Energy Spread (Distribution) due to Electron Energy Analyzer is 0.25 eVÂ Â (100% Gaussian)
FWHMhemi-sphere broadening <0.25eV
Characterisation of the VG ESCALAB 220i-XL instrumental broadening functions by XPS measurements at the Fermi edge of silver
Journal of Electron Spectroscopy and Related Phenomena
Volume 85, Issue 3, 1 May 1997, Pages 197-203
Natural FWHM of Ar 3p in gaseous state – UPS spectrum – not corrected for HSA or Source Spread
Natural FWHM of Aluminum Al 2p using Synchrotron Radiation not corrected for HSA spread or X-ray spread
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