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In ESR study on Sm3+ ion in the intermediate-valence single crystals SmB6 spectra are first found static Jahn-Teller effect on the rare earth ion. The energy of Jahn-Teller splitting is estimated.

The narrow low intensity line with maximum at =15104 cnf1 and width 6 = 0.7 cm at T=4.2 K have been detected in absorption spectrum of regular LiTmF4 crystal. The observed line belongs to transition from ground state 3 3 3+ 12. . . . H6(F2) to lowest level '2 of F2 term of Tm (4f ) ion. The perturbation, which induces I'2 -i'2 transition, does not break S4 symmetry of Tm3 sites (axes S4 if OZ). The perturbation of this kind is the interaction of Tm3 4f-electrons with electric field, created by quadrupolar moments of lattice ions, which are induced, in turn, by incident electromagnetic wave. To calculate the components of the quadrupolar moment tensors for ions in LiTmF4 single crystal, we have formulated and solved the system of self-consistent linear equations. We take into account interactions between all induced dipolar and quadrupolar moments and their interactions with electric fields of incident waves. The calculated transition probabilities per second (given in brackets) are in qualitative accordance with experimental data: p(Wfl OZ)=O.07 s1 (0.04 1) p(W OZ)=O.02 (0.01 1)•