Electronic and vibrational spectra of CrO^2-<inf>4</inf> in cesium halide lattices

The electronic spectra of CrO2-4 ions embedded in cesium halide lattices show two well defined bands due to dipole allowed transitions along with some weak bands due to forbidden transitions. All the above bands are interpreted in terms of transitions within molecu ar orbital levels using the Ballhausen and Liehr scheme. It is observed that superposed on the electronic transitions there is a vibrational fine structure which arises due to the coupling between the electronic transitions and the totally symmetric stretching frequency of the ion. IR absorption spectrum of Analar grade CsI :CrO2-4 shows seven lines, whereas Specpure CsI :CrO2-4 shows five lines. The above spectra are interpreted on the basis of different local symmetries of CrO2-4 ions in the lattice. © 1980.