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