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Beryllium films on the tungsten {110} surface
A145 Surface Science 94 (1980) 5 1 5 - 5 2 7 © North-Holland Publishing Company
SURFACE AMPLITUDE PATTERNS: A SYMMETRY-BASED DESCRIPTION OF METAL SURFACES APPROACHED BY A SUBSTRATE Christian MINOT
Laboratoire de Chimie Thdorique, ERA 549, Universit~de Paris.Sud, F-91405 Orsay Cedex, France Olivier K A H N
Laboratoire de Spectrochimie des Eldments de Transition, ERA 672, Universit~ de Paris-Sud, F-91405 Orsay Cedex, France and Lionel SALEM
Laboratoire de Chimie Th~orique, ERA 549, Universit~ de Paris-Sud, F-91405 Orsay Cedex, France Received 23 July 1979; accepted for publication 12 December 1979 Although a great number of metal orbitals interact with a substrate approaching a metal surface, there are only a limited number of amplitude patterns available on a given site of the metal surface. These surface amplitude patterns are determined by the site symmetry of the point of attack. They are drawn out for various fcc (100) and (111) sites. These patterns should be good approximations to the relocalized orbitals created when the substrate perturbs the metal orbitals. The surface amplitude patterns also reveal that the subsurface can drastically modify the normal energy-versus-phase relationship of the surface orbitals. Some preliminary applications are given.
Surface Science 94 (1980) 5 2 8 - 5 4 6 O North-Holland Publishing Company
BERYLLIUM F I L M S O N THE TUNGSTEN ~110} SURFACE W. S C H L E N K ° a n d E. B A U E R
Physikalisches Institut der Teehnischen Universita't, D-3392 Clausthal-Zellerfeld, Germany and SFB 126, GOttingen-Clausthal, Germany Received 3 December 1979; accepted for publication 16 January 1980 The growth mode, work function, thermal desorption and structure of Be films up to several layers in thickness on a W ~110) surface are investigated. At room temperature layer-bylayer growth occurs, at least up to 3 layers. Thick films show a complex growth and annealing behavior. Within the first layer the bonding to the substrate is only slightly ionic, the bonding between the adatoms probably at least in part via indirect electronic interactions. Filling of the first layer proceeds by a sequence of discontinuous structural transformations combined with changes of the electronic properties of the deposit and of the adsorbate-substrate binding forces.
SURFACE AMPLITUDE PATTERNS: A SYMMETRY-BASED DESCRIPTION OF METAL SURFACES APPROACHED BY A SUBSTRATE Christian MINOT
Laboratoire de Chimie Thdorique, ERA 549, Universit~de Paris.Sud, F-91405 Orsay Cedex, France Olivier K A H N
Laboratoire de Spectrochimie des Eldments de Transition, ERA 672, Universit~ de Paris-Sud, F-91405 Orsay Cedex, France and Lionel SALEM
Laboratoire de Chimie Th~orique, ERA 549, Universit~ de Paris-Sud, F-91405 Orsay Cedex, France Received 23 July 1979; accepted for publication 12 December 1979 Although a great number of metal orbitals interact with a substrate approaching a metal surface, there are only a limited number of amplitude patterns available on a given site of the metal surface. These surface amplitude patterns are determined by the site symmetry of the point of attack. They are drawn out for various fcc (100) and (111) sites. These patterns should be good approximations to the relocalized orbitals created when the substrate perturbs the metal orbitals. The surface amplitude patterns also reveal that the subsurface can drastically modify the normal energy-versus-phase relationship of the surface orbitals. Some preliminary applications are given.
Surface Science 94 (1980) 5 2 8 - 5 4 6 O North-Holland Publishing Company
BERYLLIUM F I L M S O N THE TUNGSTEN ~110} SURFACE W. S C H L E N K ° a n d E. B A U E R
Physikalisches Institut der Teehnischen Universita't, D-3392 Clausthal-Zellerfeld, Germany and SFB 126, GOttingen-Clausthal, Germany Received 3 December 1979; accepted for publication 16 January 1980 The growth mode, work function, thermal desorption and structure of Be films up to several layers in thickness on a W ~110) surface are investigated. At room temperature layer-bylayer growth occurs, at least up to 3 layers. Thick films show a complex growth and annealing behavior. Within the first layer the bonding to the substrate is only slightly ionic, the bonding between the adatoms probably at least in part via indirect electronic interactions. Filling of the first layer proceeds by a sequence of discontinuous structural transformations combined with changes of the electronic properties of the deposit and of the adsorbate-substrate binding forces.