Optical and vibronic spectra of MnO in cesium bromide

Optical absorption spectrum of cesium bromide doped with MnO ion shows five bands. All these above bands are interpreted in terms of transitions within molecular orbital levels using the Ballhausen‐Liehr scheme. It is observed that, superposed on the electronic transition associated with the band at 6000 Å, there is a vibrational fine structure which arises due to the coupling between the electronic transition and the totally symmetric stretching vibration of the ion. The IR absorption spectrum of specpure CsBr:MnO shows four lines which are interpeted on the basis of different local symmetries of MnO ion in the lattice.