Chemisorption geometry on cleaved III-V surfaces: Cl on GaAs, GaSb, and InSb

Experimental angle-integrated photoemission curves taken on Cl-covered (110) surfaces of GaAs, GaSb, and InSb have been compared to tight-binding calculations of the local density of states. The results clearly demonstrate that the Cl adatoms are bound to the anion substrate atoms rather than to the cation substrate atoms. Some qualitative information is also provided on surface relaxation and on chemisorption bond lengths.