Abstract
Impurity-activated lattice absorption was first observed in alkali halide crystals by Schäfer(1) in 1958. The infrared absorption occurred at a frequency far above the maximum phonon frequency of the host lattice and was correctly identified as due to a localized lattice mode. Because not only localized modes but other types of lattice impurity modes already had been predicted in a variety of theoretical studies, (2) Schäfer’s success signaled that perhaps some of these other impurity modes could also be observed. Here we shall consider the observation of some impurity modes by spectroscopic methods.
This research was mainly supported by the U. S. Atomic Energy Commission under contract AT(30–1)-2391, Technical Report No. NYO-2391-62. Additional support was received from the Advanced Research Projects Agency through the use of space and technical facilities of the Materials Science Center at Cornell University.
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Sievers, A.J. (1968). Localized and Resonance Modes in Ionic Crystals. In: Wallis, R.F. (eds) Localized Excitations in Solids. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-6445-8_3
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