ElecStateLabel is a label identifying the electronic state: X, A, a, B, etc.
F is the quantum number associated with the total angular momentum including nuclear spin: F = J + I1 if only one such coupling is resolved, F = Fj-1 + Ij if two or more such couplings are resolved.
Fj is the intermediate angular momentum quantum number associated with the coupling of the nuclear spin angular momentum of nucleus j to the intermediate angular momentum: F1 = J + I1 or Fj = Fj-1 + Ij; Fj is often not a good quantum number.
I is a nuclear spin quantum number corresponding to the coupling of the nuclear spin angular momenta of two or more identical nuclei, I = I1 + I2 + ....
J is the quantum number associated with the total angular momentum excluding nuclear spin, J.
K is the quantum number associated with the projection of the total angular momentum excluding nuclear spin, J, onto the molecular symmetry axis.
l is a signed quantum label often used to describe the total vibrational angular momentum.
li is the vibrational angular momentum quantum number associated with the degenerate νi normal mode; positive and negative values distinguish l–type doubling components.
parity is the total parity: the parity of the total molecular wavefunction (excluding nuclear spin) with respect to inversion through the molecular centre of mass of all particles' coordinates in the laboratory coordinate system, the E* operation.
r is a named, positive integer label identifying the state if no other good quantum numbers or symmetries are known.
rotSym is the symmetry species of the rotational wavefunction, in some appropriate symmetry group.
rovibSym is the symmetry species of the rovibrational wavefunction, in some appropriate symmetry group.
vi is the vibrational quantum number associated with the νi normal mode.
vibInv is the parity of the vibrational wavefunction with respect to inversion through the molecular centre of mass in the molecular coordinate system. Only really necessary for molecules with a low barrier to such an inversion (for example, NH3).
vibSym is the symmetry species of the vibrational wavefunction, in some appropriate symmetry group.