Polarized Raman spectra of single-crystal lanthanide oxychlorides

Abstract

The analyses of reported Raman spectra from tetragonal lanthanide oxychlorides are inconsistent. Nuclear site symmetry analysis predicts six Raman-active bands. Five peaks are consistently observed, whereas the sixth remains controversial. Also, two different sets of irreducible representations are reported: 2A 1g + 3E g + B 2g(or B 1g) + 3A 2u + 3E u. To resolve discrepancies in the reported symmetry assignments, a polarized Raman spectral analysis of single-crystal PrOC1 was undertaken. The correct irreducible representation contains the B 2g element.