The temperature dependence of the infrared spectrum of CO chemisorbed on Rh supported by Al2O3 has been measured. A shift in the CO stretching mode of 1.4×10−2 cm−1 K−1 to higher wave number is observed on cooling. An electrodynamic model of the surface interactions is presented. The model accounts for both the magnitude and direction of the observed shift.
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Antoniewicz et al. (1980) studied this question.