Analogs of the Rose center in the alkaline earth fluorides: Production by hydrolysis and identification by Raman spectroscopy

A family of molecular centers of the type (RO2M)2+ is shown to exist in the alkaline earth fluorides MF2 (M = Ca, Sr, Ba) doped with R = Sc, Y, Lu, Ho when these crystals have been hydrolyzed and subsequently X-rayed. The centers were identified with the aid of Raman spectroscopy and, in the past, with electron paramagnetic resonance (EPR)

Multiple-order resonant Raman scattering of the localized molecular rose center in BaF2

The rose center in BaF2 is investigated by resonant Raman scattering. The spectra obtained at liquid-helium temperature show multiple order and combination bands of the internal local modes (up to the sixth order), and associated side bands of the lattice. The temperature dependence of the linewidth of the local-mode transitions has been investigated and is explained as being due to anharmonic coupling to the lattice

Raman investigation of the structural and vibrational properties of the rose center in alkaline earth fluorides

A Raman investigation performed on the rose center in RF2 (R = Ca, Sr, Ba) shows that its structure is (YO2R)2+. This cluster has almost in-band vibrations moderately coupled to the lattice in CaF2 and almost totally localized modes in BaF2

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