Core-level photo-emission and -absorption spectra in Rare Earth hydroxide series

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Abstract
We calculate the 3d-photoemission spectra of R(OH)3 compounds (with R = La, Ce, Pr, Nd and Sm) by using the single impurity Anderson model. Then by analysing the corresponding experimental data we are able to estimate the key parameter values of the hydroxides considered within our model calculation. We also analyse the 2p-photoabsorption spectra of La(OH)3, Ce(OH) 3 and Sm(OH)3 which have been observed recently : in addition to the parameters already introduced we need two new parameters (U fd and Udc) which are specific to the photoabsorption process. From our systematic study of the lanthanide hydroxide series (at least from La to Sm) we deduce that the available experimental 3d-photoemission spectrum of Ce(OR)3 is probably not consistent with a genuine sample of Ce(OH)3 — due to surface contamination. Nevertheless we are able to predict the corresponding intrinsic 3d-photoemission spectrum and in addition we present some new preliminary experimental measurements on that compound