Abstract
The change in the phonon spectrum of KI due to the pressure-induced phase transition from the B1 phase (rock salt) to the B2 phase (cesium chloride) was observed at room temperature by the absorption measurement using a diamond anvil cell. The synchrotron radiation was used as the light source in the far infrared region. From the energy shift of the transverse optic (TO) phonon with pressure, the mode Gruneisen parameters were found to be 1.70 in the B1 phase and 2.70 in the B2 phase. The TO phonon energy of KI in the B2 phase was found to be 106 cm -1 .
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