Abstract
The anomalous lineshapes in the B 1 symmetry modes in crystal KH 2PO 4 are explained in terms of anharmonic interactions between the modes and a broad background continuum. Excellent agreement with experimental results is obtained by applying a quantum mechanical formalism developed by Fano for the autoionization of atoms. Similar to the anomalies in the E spectrum treated by Scott and Wilson, the coupling parameter q in this case was found to be insensitive to temperature changes, while the linewidth increased linearly with temperature. The analogous spectrum in crystal NH 4H 2PO 4 (ADP) is qualitatively explained as a strong coupling of two vibrational modes to the same continuum.
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