THE INFLUENCE OF SOFT MODE ADSORBATE VIBRATIONS ON NEXAFS ANALYSES - NO ON PD(110)

被引：35

作者：

SINGH, J

WALTER, WK

ATREI, A

KING, DA

机构：

[1] Department of Chemistry, University of Cambridge, Cambridge, CB2 1EW, Lensfield Road

来源：

CHEMICAL PHYSICS LETTERS | 1991年 / 185卷 / 5-6期

关键词：

D O I：

10.1016/0009-2614(91)80236-Q

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：

Near-edge X-ray absorption fine structure (NEXAFS) measurements have been performed on NO adsorbed on Pd{110} using a polarized light source at a range of incidence angles. An analysis of intensities of sigma and pi-resonance features is made which includes both the average orientation of the molecule and contributions arising from a low frequency, in-plane hindered-translation mode. The analysis indicates that at all coverages NO is upright, with a hindered-translation mode frequency of 68 cm-1 directed along the <001> azimuth. The normal frozen-molecule analysis would, incorrectly, yield a tilt angle of 22-degrees; adsorbate molecular orientation cannot be reliably obtained from NEXAFS data at 300 K without including the effect of these high-amplitude modes.

引用

页码：426 / 432

页数：7

共 19 条

[1] POSITION OF THE SIGMA-SHAPE AND PI-RESONANCES OF C2H2, C2H4 AND C2H6 ON CU(100) AT 60-K - A NEXAFS STUDY [J].