Quantum defect of the level.
For an example, see Rydberg energy levels example snippet.
- Parameters:
n (int) – principal quantum number
l (int) – orbital angular momentum
j (float) – total angular momentum
s (float) – (optional). Total spin angular momentum.
Default value of 0.5 correct for Alkali atoms. For divalent
atoms it has to be explicitly defined.
- Returns:
quantum defect
- Return type:
float
