Question

Consider the transition 2P_1/2 → 2S_1/2, for sodium in the magnetic field of 1.0 T, given that the energy splitting ΔE = gμ_B Bm_j, where μ_B is the Bohr magneton. Draw the sketch.

Answer 1

For the term 2P_1/2, l = 1, j = 1/2 , s = 1/2 and g = 2/3 . For the term 2S_1/2, l = 0, j = 1/2 , s = 1/2 and g = 2. The energy levels and splitting of lines in sodium are shown in Fig. 2.7.