Abstract
We have obtained the first far infrared measurement of an atomic adsorbate-substrate stretch on a single crystal surface. The infrared reflection-absorption technique is employed onO/Ag(110), with an apparatus consisting of a laboratory source of infrared radiation, an evacuated FTIR, and a He-cooled bolometer detector. Complementary STM measurements, performed in situ, allowed rigorous characterization of surface structure. At room temperature and the lowest detectable coverage (0.14 ML), the frequency of the O Ag symmetric stretch is v SS = 319 ± 1cm −1. This band shifts continuously upwards to 335 ± 1cm −1 as coverage is increased to 0.5 ML, where the(2 × 1)-O phase is fully developed. The intensity of this dipole transition is analyzed with a standard Lorentz oscillator model. The effective charge transfer for the oscillating dipolar complex is evaluated at just0.036 ± 0.005e −, indicating that the O/Ag(110) bond is polar covalent in character. Since the observed frequency shift cannot result from simple dipole-dipole interactions alone, other physical origins are discussed.
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