SURFACE RECONSTRUCTION AND THERMAL-DESORPTION - O/AG(110) - AN EXPERIMENTAL-STUDY

被引:21
作者
CANEPA, M [1 ]
SALVIETTI, M [1 ]
TRAVERSO, M [1 ]
MATTERA, L [1 ]
机构
[1] CNR, CTR FIS SUPERFICI & BASSE TEMP, DIPARTIMENTO FIS, I-16146 GENOA, ITALY
关键词
CHEMISORPTION; OXYGEN; SILVER; SURFACE RECONSTRUCTION; THERMAL DESORPTION SPECTROSCOPY;
D O I
10.1016/0039-6028(95)00193-X
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 have studied the associative desorption of oxygen from well-defined O(nx1)-Ag(110) phases (n ranging from 8 to 2) by thermal desorption mass spectrometry. Desorption peak profiles have been compared with calculations based on a lattice-gas model [V.P. Zhdanov, Surf. Sci, 277 (1992) 155] which takes into account the missing-row reconstruction of the substrate and adsorbate-adsorbate interactions along independent -O-Ag-O- rows. The model works well at low coverage accurately reproducing the peak profiles. For the O(8 x 1),O(6 x 1) and O(4 x 1) phases, assuming a value of v = 10(15) s(-1) for the pre-factor, values of approximate to 39 kcal/mol for the activation energy and approximate to -2.5 kcal/mol for the O-O effective oxygen-oxygen interaction along -O-Ag-O- rows are obtained. At high coverage the assumption of independence of -O-Ag-O-chains is no longer valid and repulsive interactions perpendicularly to the chains have to be taken into account.
引用
收藏
页码:183 / 188
页数:6
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