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Persistent photoconductivity in a Pb0.75Sn0.25Te(In) alloy initiated by monochromatic submillimeter-range radiation at wavelengths of 176 and 241 μm was observed at helium temperatures. This photoconductivity is shown to be associated with optical excitation of metastable impurity states.
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Aleksander Kozhanov, Dmitry Dolzhenko, Ivan Ivanchik, Dan Watson, Dmitry Khokhlov, "Submillimeter-radiation-induced persistent photoconductivity in Pb1-xSnxTe(In)," Proc. SPIE 5543, Infrared Spaceborne Remote Sensing XII, (4 November 2004); https://doi.org/10.1117/12.562798