SURFACE CRYSTALLOGRAPHY OF RE(0001)-(2X2)-S AND RE(0001)-(2-ROOT-3X2-ROOT) R30-DEGREES-6S - A COMBINED LEED AND STM STUDY

被引:25
作者
BARBIERI, A
JENTZ, D
MATERER, N
HELD, G
DUNPHY, J
OGLETREE, DF
SAUTET, P
SALMERON, M
VANHOVE, MA
SOMORJAI, GA
机构
[1] LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720
[2] UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720
关键词
D O I
10.1016/0039-6028(94)90799-4
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
We analyze two structures formed by sulfur adsorbed on Re(0001) by using a combination of LEED and STM techniques. At low coverage (0.25 ML) sulfur atoms adsorb in three-fold hcp hollow sites forming a (2 x 2) structure. At higher coverages (0.5 ML) sulfur adsorbs close to three-fold hcp hollow sites and forms distorted hexamers arranged in a (2 square-root 3 x 2 square-root 3)R30-degrees pattern. A complete structural determination was performed by using automated Tensor LEED, aided by STM, showing substantial substrate relaxations that become more pronounced with increasing sulfur coverage. The sulfur height above the first rhenium layer in the case of the (2 x 2) structure agrees well with that determined by a quantitative theoretical analysis of the STM images.
引用
收藏
页码:10 / 20
页数:11
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