Anomalous mobility of strongly bound surface species: Cl on GaAs(001)-c(8 x 2) |
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Authors: | McLean Kruse Guo-Ping Ruda Kummel |
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Institution: | Department of Chemistry, 0358, University of California at San Diego, 9500 Gilman Drive, La Jolla, California 92093-0358, USA. |
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Abstract: | Although strongly bound chemisorbates at low coverage readily diffuse on metal surfaces at 300 K, they generally do not diffuse on semiconductor surfaces because of a large corrugation in the adsorbate-surface interaction potential. Chlorine chemisorbed on the Ga-rich GaAs(001)-c(8x2) surface has anomalously fast diffusion even though the chemisorption state is tightly bound and highly specific. Simple Hartree-Fock total energy calculations suggest that this diffusion of strongly bound adsorbates can occur at 300 K because there are multiple nearly degenerate adsorbate sites. |
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