Ai. Boronin et al., SURFACE-ACOUSTIC-WAVE RESONANCE SPECTROSCOPY (SAWRS) AS A NOVEL TECHNIQUE TO STUDY SURFACE PHENOMENA, Surface and interface analysis, 22(1-12), 1994, pp. 585-589
A new method is proposed for investigating surface phenomena based on
the observation of the acoustic vibration modes of surface structures
at high resolution. Experimental SAWR spectra can be obtained under a
narrow frequency band excitation (DELTAomega/omega approximately 10(-5
) in a wide range (100 kHz-10 MHz). Application of this method to Ag(1
11) and Pt(100) single crystals reveals the existence of very narrow r
esonant acoustic vibration modes with DELTAomega/omega approximately 1
0(-3)-10(-4) demonstrating strong anomalies in the phonon energy distr
ibution function of solids. The behaviour of these anomalous peaks is
very sensitive to surface structure and to the presence of adsorbates.