Overtone Spectroscopy of the OH and OD Stretch Modes in LiNbO₃

Abstract

Abstract Infrared absorption bands due to the fundamental and the overtone of OH and OD stretch modes are investigated in undoped, Mg‐doped, and benzoic acid treated LiNbO 3 . The different bands are interpreted using an anharmonic oscillator model. Spectroscopic parameters determined from the isotope shift and the overtone frequencies are in good agreement. The anharmonicity found is comparable to that of OH in other ABO 3 compounds and in alkali halides.