Spectroscopic Properties of the f-Elements in Compounds and Solutions

Abstract

In this systematic examination of some of the spectroscopic properties of the f-elements we deal with both the trivalent lanthanides and actinides. We summarize the present status of our energy level calculations in single crystal matrices and in aqueous solution, and compare the predicted crystal-field structure in certain low-symmetry sites with that observed. Some interesting new structural insights are thereby gained. The state eigenvectors from these calculations are then used in part in reassessing and interpreting the intensities of transitions in aqueous solution via the Judd-Ofelt theory. The parameters of this theory derived from fitting experimental data are compared with those computed from model considerations. Finally, we discuss some recent contributions to the interpretation of excited state relaxation processes in aqueous solution.

Optical spectroscopy of Li2B4O7, CaB4O7 and LiCaBO3 borate glasses doped with europium

“…The optical absorption spectrum typical of the centres in our borate glasses will be discussed in Section 3.2. In accordance with the data [39,40], weakly resolved absorption bands observed for our glasses should be assigned to the absorption transitions 7 Fig. 1).…”

“…3). In accordance with the energy level diagram for Eu 3+ and the data [39,40], the emission bands correspond to the 5 D 0 → 7 F J (J = 04) f-f transitions of Eu 3+ ions, which are indicated in Fig. 3.…”

Electronic Structure of Organometallic Complexes of f Elements. Are Molecular Orbital Calculations a Useful Tool for Spectroscopists?

“…Η is usually split into two terms H f1 and HCF which consider the interactions within the central ion [20] and the effects of the CF [2,l], respectively. The CF Hamiltonians for C3v and D3h symmetry which are of interest in this work are given by…”

Interpretation of europium(III) spectra

“…Chemists who have been trained in the synthesis and characterization of luminescent lanthanide complexes are often lacking a sound theoretical background in lanthanide spectroscopy. The classical books or reviews on spectroscopy of rare earths are often too theoretical or put little emphasis on the relationship between features observed in spectra and structural properties [61][62][63][64][65][66][67][68][69][70]. There exist several reviews on the luminescence of lanthanide-based molecular materials or photophysics of lanthanides, but only few of them focus on the Eu 3+ ion in detail [23,24,27,28,33,64,.…”