Siegbahn notation

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The Siegbahn notation is used to name the spectral lines that are characteristic to elements. It was created by Manne Siegbahn.

The characteristic spectral lines correspond to electronic transitions (electrons of the atom "jump" from a level to the other). In the case of an absorption line, the electron jumps from a low energy level to a high energy level; in the case of an emission line, the electron jumps from a high energy level to a low energy level.

The table below show the correspondence between the name of a few lines and the electronic levels.

Siegbahn notation
Low energy level High energy level Name of the line
K (1S0) L3 (2P3/2) Kα1
L2 (2P1/2) Kα2
M3 (3P3/2) Kβ1
L3 (2P3/2) M5 (3D5/2) Lα1
L2 (2P1/2) M4 (3D3/2) Lβ1
M5 (3D5/2) N7 (5P3/2) Mα1

This notation is widely used in spectroscopy, but the IUPAC (International union of pure and applied chemistry) recommends another notation.

Correspondence between the IUPAC Siegbahn notations
Siegbahn notation IUPAC notation
Kα1 K-L3
Kα2 K-L2
Kβ1 K-M3
Lα1 L3-M5
Lβ1 L2-M4
Mα1 M5-N7

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