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Incoming links: Electron spectroscopy
Kai Siegbahn Created 2026-10-24 Updated 2026-11-05
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.[ref]
Physics.[ref]
https://www.pas.va/en/academicians/deceased/siegbahn.html. Independent professional profile
Portrait of Kai Siegbahn
. Jan Collsiöö, original photograph at Uppsala, 21 October 1981; derivative crop by Materialscientist. Nationaal Archief / ANEFO collection. Creative Commons Attribution-Share Alike 3.0 Netherlands., via Wikimedia Commons. Source.
Nobel Prize in Physics in 1981 2026-10-18
Nicolaas Bloembergen and Arthur Leonard Schawlow received one quarter each for developing laser spectroscopy. Kai Manne Börje Siegbahn received one half for developing high-resolution electron spectroscopy.[ref]
The Nobel Prize in Physics 1981 by Nobel Prize Outreach. Individual 1981 record reproduced in laser-physics lecture slides: Bloembergen and Schawlow one-quarter each, laser spectroscopy; Siegbahn one-half, electron spectroscopy. Official individual Siegbahn facts independently confirms his half and distinct motivation.