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The N4,,(4d) spectra of the atoms of Rare-Earth elements in metals and oxides have been examined under monoenergetic electron beam-excitation with energies varying in the region containing 4d thresholds. The full pattern of the radiative decay of the states of Rare-Earth atoms with a vacancy in the 4d shell have been obtained. Besides, the process of radiative electron capture into free 4f states (inverse photoemission, IPE) has been studied.Attention has been paid to the results of the competition between the capture and 4d shell excitation. The results obtained have been used for the analysis of the structure of 4d appearance potential spectra.

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