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By experimental exploration of the so-called $\lambda $-Zeeman techniquebased on Rb nano-cell use we reveal for the first time a strong modification ofthe probability of the $^{87}$Rb, $D_2$ line $F_g=1 \rightarrow F_e=0, 1, 2, 3$atomic transitions, including forbidden $F_g=1, m_F =0 \rightarrow F_e=1, m_F=0$ and $F_g=1, m_F =-1 \rightarrow F_e=3, m_F =-1$ transitions (these areforbidden transitions when $B = 0$) in a strong external magnetic field $B$ inthe range of 100 - 1100 G. For $\pi$-polarized exciting diode laser radiation($\lambda = 780$ nm) these forbidden transitions at $B > 150$ G are among thestrongest atomic transitions in the detected transmission spectra. Frequencyshifts of the individual hyperfine transitions versus magnetic field are alsopresented: particularly, $F_g=1, m_F =+1 \rightarrow F_e=1, m_F =+1$ atomictransition has a unique behavior, since its frequency remains practicallyunchanged when $B$ varies from 100 to 1100 G. Developed theoretical model welldescribes the experiment.

the european physical journal. d, atomic, molecular and optical physics/the european physical journal. d, atomic, molecular, optical and plasma physics

Study of forbidden atomic transitions on $D_2$ line using Rb nano-cell placed in external magnetic field