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degeneracy weight

(statistical weight, degeneracy, degeneracy weighting)
(number of quantum states with same energy level)

Degeneracy weight (or statistical weight, degeneracy weighting, or simply degeneracy) is a count of the quantum states of an atom (state of excitation) that have the same energy level. It is useful when the number of particles at a particular energy level is what's directly needed rather than their exact quantum states.

It is used in the Boltzmann equation. The energy levels considered "the same" might be extremely close, but not exact, a difference that leads to forbidden lines, fine structure and hyperfine structure.

(physics,quantum mechanics)

Referenced by:
Boltzmann equation