
30 Handbook of Magnetic Measurements
The splitting of the energy levels can be observed as
the emission (or absorption—in this case, it is the inverse
Zeeman effect) of the light of the wavelength (or fre-
quency) corresponding with transitions of the electrons
between sublevels of the energy. The absorption or dis-
persion of the light exhibits resonance feature versus
magnetic eld or frequency (resonance frequency is ω
0
).
These effects are used for measurements of very small
magnetic elds. Alkaline vapors are used commonly as
a specimen for such measurements. Figure 2.47 presents
the energy levels splitting of the rubidium Rb87.
T