title: Anomalous mobility of strongly bound surface species: Cl on GaAs(001)-c(8 x 2)
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.
authors.affiliation: Department of Chemistry, 0358, University of California at San Diego, 9500 Gilman Drive, La Jolla, California 92093-0358, USA.
authors.initials: JG
authors.lastname: McLean
authors.initials: P
authors.lastname: Kruse
authors.initials: J
authors.lastname: Guo-Ping
authors.initials: HE
authors.lastname: Ruda
authors.initials: AC
authors.lastname: Kummel