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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