Abstract
The electron-stimulated desorption ion angular distribution (ESDIAD) technique combined with a digital subtraction method have been employed to generate difference ESDIAD patterns between measurements made at 130 and 305 K for both adsorbed Cl and OH on Si(100). The difference ESDIAD patterns reveal, in real space, images qualitatively related to the thermally excited vibrational amplitudes of the adsorbates. This permits a qualitative visualization of the potential energy surface associated with an adsorbate on its adsorption site. For Cl Si(100) , isotropic thermal broadening of the Cl + beams from 130 to 305 K is observed. In contrast, OH Si(100) exhibits anisotropic thermal broadening of the H + beams on heating from 130 to 305 K. These results are correlated with the vibrational frequencies of the surface oscillators.
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