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Polarized absorption spectra of single-crystal Nd0.5Gd0.5Fe3(BO3)4 werestudied in the region of transition 4I9/2-(4G5/2+2G7/2) in Nd3+ ion as afunction of temperature (2-34 K) and magnetic field (0-65 kOe). Spectra ofnatural circular dichroism were measured in the range of 5-40 K. It was foundout that the local magnetic properties in vicinity of the excited ionsubstantially depend on its state. In particular, a weak ferromagnetic momentappears in some excited states. It was found out that selection rules forelectron transitions in magnetically ordered state substantially deviate fromthose in paramagnetic state of the crystal. They are different for differenttransitions and they are very sensitive to orientation of the sublatticemagnetic moment relative to the light polarization. In the spectrum of thenatural circular dichroism, the transition is revealed which is not observed inthe absorption spectrum.

Peculiarities of the 4I9/2-(4G5/2+2G7/2) transition behavior in  Nd0.5Gd0.5Fe3(BO3)4 and local magnetic properties of the crystal in the  excited states