Angular distributions of x-ray-excited Na 1s photoelectrons and Na KVV Auger electrons emitted from c(2×2)-Na/Al(001) have been measured over the full 2π solid angle above the Al(001) surface. A detailed study involving single-scattering cluster calculations and an R-factor analysis has been performed to determine the room-temperature adsorption site of Na on Al(001). The best agreement with experiment is obtained for a configuration in which domains of Na atoms adsorbed in the hollow site and in the substitutional site coexist on the surface. This unusual and unexpected behavior has not been observed for an alkali-metal-on-metal adsorption system up to now, but it can be understood on the basis of very recent results from first-principles density-functional theory
Local structure of c(2x2)-Na on Al(001): Experimental evidence for the coexistence of intermixing and on-surface adsorption
AGOSTINO, Raffaele Giuseppe;CHIARELLO, Gennaro
1994-01-01
Abstract
Angular distributions of x-ray-excited Na 1s photoelectrons and Na KVV Auger electrons emitted from c(2×2)-Na/Al(001) have been measured over the full 2π solid angle above the Al(001) surface. A detailed study involving single-scattering cluster calculations and an R-factor analysis has been performed to determine the room-temperature adsorption site of Na on Al(001). The best agreement with experiment is obtained for a configuration in which domains of Na atoms adsorbed in the hollow site and in the substitutional site coexist on the surface. This unusual and unexpected behavior has not been observed for an alkali-metal-on-metal adsorption system up to now, but it can be understood on the basis of very recent results from first-principles density-functional theoryI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
