TIME-OF-FLIGHT SCATTERING AND RECOILING SPECTROMETRY (TOF-SARS) ANALYSIS OF PT(110) .1. QUANTITATIVE STRUCTURAL STUDY OF THE CLEAN (1X2) SURFACE

被引:21
作者
MASSON, F
RABALAIS, JW
机构
[1] University of Houston, Department of Chemistry, Houston
基金
美国国家科学基金会;
关键词
D O I
10.1016/0039-6028(91)90596-K
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
The technique of time-of-flight scattering and recoiling spectrometry (TOF-SARS) is used for quantitative structural characterization of the reconstructed (1 x 2) missing-row Pt{110} clean surface. The results are presented as scans of scattered intensity versus incident angle at two scattering angles and are interpreted in terms of simple classical concepts (shadowing, blocking, focusing). Measured critical incident and exit angles corresponding to interatomic spacings unaffected by reconstruction are used to calibrate the screening constant of the interaction potential employed in the trajectory simulations. Analysis of the surface reconstruction is performed by combining experimental data and calibrated computations. The results indicate a contraction of the first-to-second interlayer spacing (-0.22 +/- 0.07 angstrom, i.e., -16 +/- 5%), a buckling of amplitude 0.19 +/- 0.13 angstrom in the third layer and, possibly, a row-pairing in the second layer. These observations are in agreement with LEED, MEIS, GXRD, and RHEED experiments.
引用
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页码:245 / 257
页数:13
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