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The structural relations between the stable stepped copper faces upon oxygen adsorption and the oxygen superstructures on Cu(100) and Cu(110)
A133 200
Surface Science 182 (1987) 200-212 North-Holland, Amsterdam
THE STRUCTURAL RELATIONS BETWEEN THE STABLE STEPPED COPPER FACES UPON OXYGEN ADSORPTION AND THE OXYGEN SUPERSTRUCTURES ON Cu(100) AND Cu(ll0) J.C. B O U L L I A R D
and M.P. SOTTO
Groupe de Physique des Solides de l'Ecole Normale Sup~rieure, Universit~ Paris VII, Tour 23, 2, Place Jussieu, 75251 Paris Cedex 05, France Received 17 July 1986; accepted for publication 21 October 1986 This paper is concerned with the general structural relations we have deduced after LEED studies of oxygen adsorption on the (hkO) and (hkk) stepped faces associated with Cu(100) and the (hkO) faces associated with Cu(110). Strong structural relations between the oxygen superstructures on the low index faces and the structures of the stable complex Cu faces are evidenced. Such relations imply some remarks about the model of the oxygen settlement on the low index and stable stepped faces.
Surface Science 182 (1987) 213-230 North-Holland, Amsterdam
213
INVESTIGATION USING SEXAFS
O F T H E C u ( l l l ) (v~ × v ~ ) R 3 0 ° - C I S T R U C T U R E AND PHOTOELECTRON DIFFRACTION
M.D. CRAPPER, D.P. WOODRUFF
C.E, R I L E Y
*, P.J.J. S W E E N E Y ,
C.F. McCONVILLE,
Physics Department, University of Warwick, Coventry CV4 7AL, UK and Robert G. JONES Chemistry Department, University of Nottingham, Nottingham NG7 2RD, UK Received 20 August 1986; accepted for publication 30 October 1986 SEXAFS measurements above the C1 K-edge reveal that the Cu-CI distance is the Cu(111)(vr3 x V~)R30°-C1 structure is 2.39+0.02 A, with adsorption in three-fold symmetric hollow sites. These measurements are not, however, able to distinguish the two inequivalent hollow sites on this surface, even with the aid of multi-shell simulations. Photoelectron diffraction data for the Clls state, taken at kinetic energies between 100 and 400 eV are interpreted with the aid of single scattering calculations and shown to resolve this question, demonstrating that the C1 atoms adopt the same sites as would be occupied by the next fcc metal atom layer.
Surface Science 182 (1987) 200-212 North-Holland, Amsterdam
THE STRUCTURAL RELATIONS BETWEEN THE STABLE STEPPED COPPER FACES UPON OXYGEN ADSORPTION AND THE OXYGEN SUPERSTRUCTURES ON Cu(100) AND Cu(ll0) J.C. B O U L L I A R D
and M.P. SOTTO
Groupe de Physique des Solides de l'Ecole Normale Sup~rieure, Universit~ Paris VII, Tour 23, 2, Place Jussieu, 75251 Paris Cedex 05, France Received 17 July 1986; accepted for publication 21 October 1986 This paper is concerned with the general structural relations we have deduced after LEED studies of oxygen adsorption on the (hkO) and (hkk) stepped faces associated with Cu(100) and the (hkO) faces associated with Cu(110). Strong structural relations between the oxygen superstructures on the low index faces and the structures of the stable complex Cu faces are evidenced. Such relations imply some remarks about the model of the oxygen settlement on the low index and stable stepped faces.
Surface Science 182 (1987) 213-230 North-Holland, Amsterdam
213
INVESTIGATION USING SEXAFS
O F T H E C u ( l l l ) (v~ × v ~ ) R 3 0 ° - C I S T R U C T U R E AND PHOTOELECTRON DIFFRACTION
M.D. CRAPPER, D.P. WOODRUFF
C.E, R I L E Y
*, P.J.J. S W E E N E Y ,
C.F. McCONVILLE,
Physics Department, University of Warwick, Coventry CV4 7AL, UK and Robert G. JONES Chemistry Department, University of Nottingham, Nottingham NG7 2RD, UK Received 20 August 1986; accepted for publication 30 October 1986 SEXAFS measurements above the C1 K-edge reveal that the Cu-CI distance is the Cu(111)(vr3 x V~)R30°-C1 structure is 2.39+0.02 A, with adsorption in three-fold symmetric hollow sites. These measurements are not, however, able to distinguish the two inequivalent hollow sites on this surface, even with the aid of multi-shell simulations. Photoelectron diffraction data for the Clls state, taken at kinetic energies between 100 and 400 eV are interpreted with the aid of single scattering calculations and shown to resolve this question, demonstrating that the C1 atoms adopt the same sites as would be occupied by the next fcc metal atom layer.