Abstract

Persistent IR spectral holes have been burned for the first time to our knowledge in the fundamental stretching mode (near 3.9 μm) of the SH molecule, matrix isolated in alkali halides, by double-doping the host with a small amount (2 mol. %) of a second alkali halide. A model is proposed for the hole-burning mechanism, involving 180° reorientations of the SH molecules between configurations rendered inequivalent by strain field gradients arising from the double-doping. The holes are found to decay within tens to hundreds of seconds at 1.5 K, implying that the barriers to the head-to-tail flips must be quite small.

© 1992 Optical Society of America

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