X-ray notation
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.
Conversion
| Quantum Numbers | Atomic Notation | X-ray Notation | |||
|---|---|---|---|---|---|
| n | l | s | j | ||
| 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 |
Use
- 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 absorbed 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 absorb 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.
See also
- Siegbahn notation for the names of spectral lines used in X-ray spectroscopy
References
- ↑ 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
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