X-ray notation is a method of labeling atomic orbitals that grew out of X-ray science. Also known as IUPAC notation, it was adopted by the International Union of Pure and Applied Chemistry in 1991 as a simplification of the older Siegbahn notation.[1] In X-ray notation, every principal quantum number is given a letter associated with it. In many areas of physics and chemistry, atomic orbitals are described with spectroscopic notation (1s, 2s, 2p, 3s, 3p, etc.), but the more traditional X-ray notation is still used with most X-ray spectroscopy techniques including AES and XPS.
Quantum numbers | Atomic notation | X-ray notation | |||
---|---|---|---|---|---|
1 | 0 | 1/2 | 1/2 | 1s1/2 | K1 |
2 | 0 | 1/2 | 1/2 | 2s1/2 | L1 |
2 | 1 | 1/2 | 1/2 | 2p1/2 | L2 |
2 | 1 | 1/2 | 3/2 | 2p3/2 | L3 |
3 | 0 | 1/2 | 1/2 | 3s1/2 | M1 |
3 | 1 | 1/2 | 1/2 | 3p1/2 | M2 |
3 | 1 | 1/2 | 3/2 | 3p3/2 | M3 |
3 | 2 | 1/2 | 3/2 | 3d3/2 | M4 |
3 | 2 | 1/2 | 5/2 | 3d5/2 | M5 |
4 | 0 | 1/2 | 1/2 | 4s1/2 | N1 |
4 | 1 | 1/2 | 1/2 | 4p1/2 | N2 |
4 | 1 | 1/2 | 3/2 | 4p3/2 | N3 |
4 | 2 | 1/2 | 3/2 | 4d3/2 | N4 |
4 | 2 | 1/2 | 5/2 | 4d5/2 | N5 |
4 | 3 | 1/2 | 5/2 | 4f5/2 | N6 |
4 | 3 | 1/2 | 7/2 | 4f7/2 | N7 |
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