Standard Article

X-ray Absorption Spectroscopy

  1. James E Penner-Hahn

Published Online: 3 MAY 2005

DOI: 10.1038/npg.els.0002984



How to Cite

Penner-Hahn, J. E. 2005. X-ray Absorption Spectroscopy. eLS. .

Author Information

  1. The University of Michigan, Ann Arbor, Michigan, USA

Publication History

  1. Published Online: 3 MAY 2005


An absorption ‘edge’ is the abrupt increase in absorbance that occurs when the energy of the incident light (typically light in the X-ray region of the electromagnetic spectrum) exceeds the binding energy of a core electron. X-ray absorption spectroscopy uses the structured absorption on the high-energy side of an absorption edge to determine the local structure of the X-ray-absorbing atom.


  • EXAFS;
  • XANES;
  • core-level spectroscopy;
  • electronic-structure;
  • oxidation state