Siegbahn Notation

Nomenclature for characteristic x-rays introduced by Manne Siegbahn in 1923. This system is based on relative intensity of lines from different series. Characteristic X-rays named according to the shell being filled (K, L, M …) and the number of shells changed by electron (α = 1 shell, β = 2 shells, γ = 3 shells, etc.). Because this spectrographic nomenclature was developed before the electronic structure of atoms was well-understood, there are inconsistencies. These inconsistencies were eliminated in the IUPAC (International Union of Pure and Applied Chemistry) notation.