Abstract
Adsorbed molecules on alkali halide surfaces serve as model systems for the study of physisorption, two dimensional phase transitions, vibrational relaxation, laser induced desorption, and surface chemistry. With few exceptions, previous measurements of these substrates have used films rather than well defined crystal faces. We report here, for the first time, comparisons of the infrared spectroscopy of CO on NaCl film and NaCl(100). For monolayer coverage, the vibrational frequency of CO is the same on film or on the (100) face. However, the bandwidth is considerably more narrow on the well defined surface. Polarization measurements show that CO is aligned perpendicular to the (100) face. The narrow and easily observed absorption features will make the infrared spectroscopy of adsorbed molecules a sensitive probe of well defined alkali halide surface interactions.
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