differ by a unit. A great many lines are, however, known for which the change of
is 0, and a few for which it is 2. In the simpler spectra, such lines are faint, except when produced under the influence of a strong magnetic field; but in the more complex spectra they are often numerous and strong.
“The inner quantum number (
) differs from one component of a multiple term to another, and also in the various series and systems, according to the following scheme.
| Series | Singlets | Doublets | Triplets | Quartets | Quintets | Sextets | Septets | |
|---|---|---|---|---|---|---|---|---|
| 1 | s | j = 0 | 1 | 1 | 2 | 2 | 3 | 3 |
| 2 | p | 1 | 1,2 | 0,1,2 | 1,2,3 | 1,2,3 | 2,3,4 | 2,3,4 |
| 3 | d | 2 | 2,3 | 1,2,3 | 1,2,3,4 | 0,1,2,3,4 | 1,2,3,4,5 | 1,2,3,4,5 |
| 4 | f | 3 | 3,4 | 2,3,4 | 2,3,4,5 | 1,2,3,4,5 | 1,2,3,4,5,6 | 0,1,2,3,4,5,6 |
| 5 | g | 4 | 4,5 | 3,4,5 | 3,4,5,6 | 2,3,4,5,6 | 2,3,4,5,6,7 | 1,2,3,4,5,6,7 |
“Combinations occur only between terms for which