X-ray notation is a method of labeling atomic orbitals that grew out of X-ray science. It is still traditionally used with most X-ray spectroscopy techniques including AES and XPS. In X-ray notation, every principal quantum number is given a letter associated with it.
(n l s j)
|Atomic Notation||X-ray Notation|
|1 0 ±1/2 1/2||1s(1/2)||K1|
|2 0 ±1/2 1/2||2s(1/2)||L1|
|2 1 -1/2 1/2||2p(1/2)||L2|
|2 1 +1/2 3/2||2p(3/2)||L3|
|3 0 ±1/2 1/2||3s||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|
- X-ray sources are classified by the type of material and orbital used to generate them. For example, CuKα X-rays are emitted from the K orbital of copper.
- X-ray absorption is reported as which orbital absorped the x-ray photon. In EXAFS and XMCD the L-edge or the L absorption edge is the point where the L orbital begins to absorp x-rays.
- Auger peaks are identified with three orbital definitions, for example KL1L2. In this case, K represents the core level hole, L1 the relaxing electron's initial state, and L2 the emitted electron's initial energy state.
- Dr. Garrett's Class Notes page 12 http://www.cem.msu.edu/~cem924sg/Topic09.pdf Retrieved 10-07-08
- IUPAC Table VIII.1 page 5 http://old.iupac.org/reports/V/spectro/partVIII.pdf Retrieved 30-05-09