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The Zeeman effect is an important topic in atomic spectroscopy. The inducedchange in transition frequencies and amplitudes finds applications in theEarth-field-range magnetometry. At intermediate magnetic field amplitude $B\simB_0 = A_\text{hfs}/\mu_B$, where $A_\text{hfs}$ is the magnetic dipole constantof the ground state, and $\mu_B$ is the Bohr magneton ($B_0\approx 1.7$ kG forCs), the rigorous rule $\Delta F = 0, \pm1$ is affected by the coupling betweenmagnetic sub-levels induced by the field. Transitions satisfying $\Delta F =\pm2$, referred to as magnetically-induced transitions, can be observed. Here,we show that a significant redistribution of the Cs $6\text{S}_{1/2}\rightarrow6\text{P}_{3/2}$ magnetically-induced transition intensities occurs withincreasing magnetic field. We observe that the strongest transition in thegroup $F_g=3\rightarrow F_e=5$ ($\sigma^+$ polarization) for $B<B_0$ cease tobe the strongest for $B>3 B_0$. On the other hand, the strongest transition inthe group $F_g=2\rightarrow F_e=4$ ($\sigma^-$ polarization) remains so for allour measurements with magnetic fields up to 9 kG. These results are inagreement with a theoretical model. The model predicts that similarobservations can be made for all alkali metals, including Na, K and Rb atoms.Our findings are important for magnetometers utilizing the Zeeman effect aboveEarth field, following the rapid development of micro-machined vapor-cell-basedsensors.

Observation of magnetically-induced transition intensity redistribution in the onset of the hyperfine Paschen-Back regime