Infrared absorption of H- and D- in the alkaline-earth fluorides

A revisit is made to the infrared absorption spectra of H- and D- local modes in the alkaline-earth fluorides. New data on the intensity ratios of the various harmonic lines, observation of a fourth harmonic for H- in CaF2 and revised values for the anharmonic potential well constants are presented, together with temperature-dependent Linewidths measured for the H- third-harmonic lines.