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We have obtained a UVES spectrum of a slowly rotating strongly magnetic Apstar, HD 144897, that exhibits very large overabundances of rare-earthelements. Here we present a detailed spectral analysis of this object, alsotaking into account effects of non-uniform vertical distribution(stratification) of chemical elements. We have determined the photosphericabundances of 40 ions. For seven elements (Mg, Si, Ca, Ti, Cr, Mn, Fe), we haveobtained a stratification model that allow us to produce a satisfactory fit tothe observed profiles of spectral lines of various strength. REEs abundances,that for the first time in the literature have been determined from the linesof the first and second ions, have been found typically four dex larger thansolar abundances. Our analysis of REE spectral lines provide a strong supportto the laboratory line classification and determination of the atomicparameters. The only remarkable exception is Nd III, for which spectralsynthesis was found to be inconsistent with the observations. We have thereforeperformed a revision of the Nd III classification. We have confirmed theenergies for 11 out of 24 odd energy levels classified previously, and we havederived the energies for additional 24 levels of Nd III, thereby increasingsubstantially the number of classified Nd III lines with corrected wavelengthsand atomic parameters.Comment: 22 pages; accepted by A&

Rare-earth elements in the atmosphere of the magnetic chemically peculiar star HD 144897