Investigation has been made on the Lγ4 X-ray emission line of barium and lanthanum, on the Lγ2,3 line of lanthanum, Lγ1 and Lβ2,15 lines of neodymium, as well as on the L3 emission band of lanthanum and L2 band of barium in the BaLaGa3O7 single crystals doped with Nd up to 2.1 at.% . The measurements have been performed using a single crystal spectrometer of the Johann type in the electron probe microanalysis mode. The chemica1 shifts and the satellites intensities observed for the doped crystals in comparison with the reference samples : BaF2 LaF3 and a metallic neodymium allowed us to describe the role of the 4f electrons of neodymium and of the 4f shell of lanthanum in the valence band of the crystals
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