Absorption and circular-dichroism spectra of LaBGeO5−Cr4+ single crystal

Abstract The absorption and circular-dichroism (CD) spectra of LaBGeO5−Cr4+ crystal have been measured at 85 and 300 K in the range 10,000–37,500 cm–1. The spectra have been interpreted by the use of crystal field theory for the states of the 3d2 configuration acted on by a potential of predominantly Td symmetry. Fundamental details of the spectra, especially of the circular-dichroism spectra, are accounted for by contributions from the field of low symmetry C1, and spin–orbit interactions in the intensities of the electronic transitions of the Cr4+ ion.