= Kai Siegbahn
{c}
{tag=Physicist}
{title2=1918–2007}
{wiki}
= Kai Manne Börje Siegbahn
{c}
{synonym}
= Kai M. Siegbahn
{c}
{synonym}
<Kai Siegbahn> developed <electron spectroscopy> as a quantitative probe of chemical and electronic structure. In <X-ray photoelectron spectroscopy>, incident <X-rays> eject <electrons> whose measured <kinetic energies> reveal their <binding energies> after the instrument's reference offset is accounted for. Small changes of a core-level <binding energy> reflect the atom's chemical environment. Resolving and calibrating these shifts makes the <spectrum> sensitive to electronic surroundings as well as elemental identity, linking the spectrometer's design with a physical inference.<Electron Spectroscopy for Atoms, Molecules and Condensed Matter by Kai Manne Börje Siegbahn>[Nobel lecture: photoelectron energy analysis, chemical shifts and instrumentation]{ref}
Physics.https://www.pas.va/en/academicians/deceased/siegbahn.html[Independent professional profile]{ref}
\Image[https://commons.wikimedia.org/wiki/Special:Redirect/file/Kai%20Manne%20B%C3%B6rje%20Siegbahn%202.jpg?width=250]
{title=Portrait of <Kai Siegbahn>}
{description=Jan Collsiöö, original photograph at Uppsala, 21 October 1981; derivative crop by Materialscientist. Nationaal Archief / ANEFO collection. https://creativecommons.org/licenses/by-sa/3.0/nl/deed.en[Creative Commons Attribution-Share Alike 3.0 Netherlands.], via Wikimedia Commons.}
{source=https://commons.wikimedia.org/wiki/File:Kai_Manne_B%C3%B6rje_Siegbahn_2.jpg}
{width=250}
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