THE GEOMETRIC AND ELECTRONIC-STRUCTURE OF OXYGEN ON A RE(10(1)BAR0) SURFACE INVESTIGATED BY LEED AND ARUPS

Autor(en): LENZ, J
RECH, P
CHRISTMANN, K
NEUBER, M
ZUBRAGEL, C
SCHWARZ, E
Stichwörter: ANGLE-RESOLVED PHOTOEMISSION; Chemistry; Chemistry, Physical; NI(110); Physics; Physics, Condensed Matter; SYSTEM
Erscheinungsdatum: 1992
Herausgeber: ELSEVIER SCIENCE BV
Journal: SURFACE SCIENCE
Volumen: 269
Ausgabe: A
Startseite: 410
Seitenende: 414
Zusammenfassung: 
The geometric and electronic structure of oxygen dissociatively adsorbed on a Re(1010BAR) surface has been studied by means of LEED and ARUPS. Five ordered oxygen LEED phases could be observed, namely, a (2 x 3)-O structure at theta(O) = 1/6, a c(2 x 4)-2O structure at theta(O) = 1/4, a (1 x 5)-2O structure at theta(O) = 2/5, a (1 x 4)-2O structure at theta(O) = 1/2, and a (1 x 3)-2O structure at theta(O) = 2/3. The two dimensional band structures of the (1 x 5)-2O and the (1 x 3)-2O phase were mapped at BESSY. Both ordered oxygen overlayers showed quite similar band structures with a pronounced dispersion along SIGMA-BAR ([1210BAR]-direction) but a lack of any dispersion along DELTA-BAR ([0001]-direction). The oxygen-induced bands could be assigned to certain symmetric and antisymmetric states of two chemisorbed oxygen atoms per unit cell by considering dipole selection rules in combination with final state symmetries. The uniform behaviour of both band structures can be interpreted by a similar local arrangement of the oxygen atoms in the unit cells of both structures.
ISSN: 00396028
DOI: 10.1016/0039-6028(92)91284-I

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