= Siegbahn photoelectron spectroscopy experiments
{c}
<Kai Siegbahn>'s early instrument used iron-free magnetic double focusing and a thin-window <Geiger-Müller counter>. His later instrument, compatible with ultra-high <vacuum>, used a spherical electrostatic <electron energy analyzer> and monochromatic <aluminum> <X-rays>. <Argon> mixed with <methane> supplied simultaneous $2p$ reference lines.<Electron Spectroscopy for Atoms, Molecules and Condensed Matter by Kai Manne Börje Siegbahn>[pp. 65–66, 82–84; Figs. 16–17]{ref}
Two <sulfur> lines in <sodium thiosulfate> distinguished chemical environments within one compound. A separate <gold> comparison showed a fingerprint obscuring substrate lines.<Electron Spectroscopy for Atoms, Molecules and Condensed Matter by Kai Manne Börje Siegbahn>[pp. 67–69, Fig. 2; thiosulfate comparison]{ref}
For an unknown sample, first document its preparation and transfer, then compare survey and detailed scans under reproducible illumination, contact and acquisition conditions. Repeat a region to test change during exposure. If a cleaning treatment is used, compare before and after rather than assuming that cleaning preserves the original <chemical bonds>. Report the <photoelectron binding energy reference>, reference lines, charge-compensation conditions and instrumental settings with the inferred <chemical shift in photoelectron spectroscopy>. A chemical interpretation should survive these checks as well as explain the line separation.
Back to article page
