Normal Zeeman Effect, an Example

Consider an emission transition between an upper 1P1 term and a lower 1D2 term (e.g., λ4526.94 Å in the spectrum of Ca I):

 

 

 

 

 

Comparison of Terms
Quantity 1P1 Term 1D2 Term
S 0 0
L (P) = 1 (D) = 2
J 1 2
g = 1 + [J(J+1) + S(S+1) - L(L+1)]/[2J(J+1)] 1 1
ΔE h Δν MJ g h Δν MJ g

 

 

                           

 

 

 

                                                                                                

                                                                                         ΔMJ =    1              0             -1

                                                                   Component Type      σ             π             σ

                                                                                        E - E0 =   δE            0          - δE

                                                                                        ν - ν0 =    Δν            0          - Δν         where Δν = "Larmor frequency" = eH / (4πmec)

 

                                                                                           
Emission line in the absence of a magnetic field:

Emission line for observer looking normal to field lines:

Emission line for observer looking parallel to field lines:

                                                                                                                       σ        π        σ