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Absorption spectroscopy recorded for annealed samples of matrix-isolated atomic europium reveals\uda pair of thermally stable sites in Ar and Kr while a single site exists in Xe. Plots of the matrix shifts\udof the visible s→p bands versus host polarizability, allowed the association of the single site in Xe\udand the blue sites in Ar and Kr. On the basis of the similar ground state bond lengths expected for\udthe Eu–rare gas (RG) diatomics and the known Na–RG molecules, the blue sites are attributed to Eu\udoccupancy in the smaller tetra-vacancy while the red sites are proposed to arise from hexa-vacancy\udsites. Both sites are of cubic symmetry, consistent with the pronounced Jahn–Teller structure present\udon the y8P ← a8S7/2 transition for these bands in the three hosts studied. Site-selective excitation\udspectroscopy has been used to reanalyze complex absorption spectra previously published by Jakob\udet al. [Phys. Lett. A 57, 67 (1976)] for the near-UV f → d transitions. On the basis that a pair of\udthermally stable sites exist in solid argon, the occurrence of crystal field splitting has been identified\udto occur for the J ≥ 5/2 level of the 8P state when isolated in these two sites with cubic symmetry.\udFrom a detailed lineshape analysis, the magnitude of the crystal field splittings on the J = 5/2 level\udin Ar is found to be 105 and 123 cm−1 for the red and blue sites, respectively

Eu/RG absorption and excitation spectroscopy in the solid rare gases: State dependence of crystal field splitting and Jahn–Teller coupling