Fig. 4: Rydberg series in RaF.
From: Electron correlation and relativistic effects in the excited states of radium monofluoride
a Effective principal quantum numbers n* and their residuals modulo 1 for excited states in RaF. Lines connect states that belong to the same Rydberg series, based on having the same Λ and similar \({n}^{*}{{\rm{mod}}}\). b Normalized difference in SO constant between states in RaF and Ra+ with corresponding (leading) configurations. The symbol ζ corresponds to the microscopic SO constant for atomic states with nℓ valence-electron configuration, and A to the molecular SO constant with nℓλ valence-electron configuration.
