Abstract
A spectroscopic technique, acoustic wave resonance spectroscopy (AWRS), has been developed to study the influence of long wavelength acoustic phonon excitations on surface chemical processes. Results are presented which demonstrate the sensitivity of AWRS to the state and composition of a Pt{100} single crystal sample, using an ultrahigh frequency and amplitude resolution acoustic spectrometer, a vector analyzer. A novel part of the ultrahigh vacuum compatible excitation system is a retractable piezo holder allowing the lithium niobate piezo transducer to be moved in situ into the bonding position against the side of the sample. Very sharp acoustic resonant modes with a Q merit factor of 1×104 appear only when the sample is clean. Carbon contamination reduces drastically both the intensity and the density of the peaks.
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