The electronic properties of a KNO, crystal near the structural phase transition are investigated by observing ultraviolet absorption spectra. The spectra show an anomalous temperature dependence near the transition point Tt,. The anomalous behaviour of the exponential absorption tails in the spectra is observed and discussed phenomenologically in relation to anomalies in the dielectric constant and lattice constant of KNO,.Die elektronischen Eigenschaften eines KN0,-Kristalls in der Nahe der strukturellen Phasenumwandlung werden mittels Temperaturabhangigkeit des Ultraviolett-Absorptionsspektrums gemessen. Es ivird gefunden, daI3 das Spektrum eine anomale Temperaturabhangigkeit in der %he des Umwandlungspunkts Ttr zeigt. Das anomale Verhalten der exponentiellen Absorptionskante im Spektrum wird im Zusammenhang mit der Anomalitat der Dielektrizitatskonstante und Citterkonstante des KN0,-Kristalls phanomenologisch behandelt.
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