Coupling of multi-LO phonons to crystal-field excitations in UO2 studied by Raman spectroscopy

@inproceedings{Livneh2008CouplingOM,
  title={Coupling of multi-LO phonons to crystal-field excitations in UO2 studied by Raman spectroscopy},
  author={Tsachi Livneh},
  year={2008}
}
Electronic Raman spectra of UO2 were measured under high hydrostatic pressure up to 21.5 GPa at room temperature. Resonant coupling was found between four (instead of the expected two) intermultiplet crystal-field (CF) excitations (γ1–γ4 ranges from 4130 to 4580 cm−1) and nLO phonons (n = 1–4, ωLO≈578 cm−1). The additional two CF excitations concurrently emerge under high pressure and are characterized by significantly higher pressure coefficients. An increase in pressure and excitation energy… CONTINUE READING