Abstract
The understanding of the infrared (IR) absorption spectrum of alkali halide crystals containing substitutional H- ion defects has been progressively improved, using a combined experimental-theoretical approach. The absorption spectrum of these crystals consists of a direct absorption in the far IR including contributions from the defects as well as the reststrahlen absorption, and a direct absorption in the vicinity of 400 cm-1 due to excitation of the high-frequency localized vibrational mode of the H- ion.(1) This local mode peak is accompanied by an anharmonic sideband which has been extensively investigated.(2, 3, 4, 5, 6) A line due to double excitation of the local mode is forbidden by symmetry, but an anharmonic sideband of this line should be observable, including an absorption peak at three times the local mode frequency.
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