Abstract
Using infrared spectroscopy we have observed Se-H stretch and wag local vibrational modes (LVM's) in AlSb. The frequencies of the wag mode harmonics are explained by perturbation theory. In addition, there is evidence of a resonant interaction between LVM's and multi-phonon modes. This interaction leads to a splitting of the Se- H stretch mode into three peaks at 1606.3, 1608.6, and 1615.7 cm -1 at liquid-helium temperatures. As the temperature or pressure is increased, the stretch mode and multi- phonon modes show anti-crossing behavior.
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