The dielectric and lattice vibrational spectrum of cuprous oxide

The i.r. reflection and Raman spectra of single crystal specimens of cuprous oxide have been studied between 20 and 900 cm−1 over a wide temperature range. The optical and dielectric parameters have been derived by Kramers-Krönig analysis and the effective dynamic charge calculated. The Raman spectrum is far more complex than a group theoretical analysis suggests and this is interpreted in terms of a selection rule breakdown in the crystal due …