论文部分内容阅读
一、引言 80年代初,随着同步辐射光源的出现和应用,发展了一系列新的表面和结构表征技术,其中以X-光吸收为基础建立的EXAFS、SEXAFS和NEXAFS已成为研究催化剂的定域结构和表征吸附物种的有力工具。第八章中已介绍了EXAFS和SEXAFS,本章将介绍NEXAFS(Near Edge X-Ray Absorption Fine Structure,近边X-光吸收精细结构)的原理及其在催化研究中的应用。 NEXAFS是研究发生在吸收边附近50eV范围内的吸收结构及其特征。在此能量范围内的吸收谱反映了
I. INTRODUCTION In the early 1980s, with the appearance and application of synchrotron radiation light sources, a series of new surface and structural characterization techniques have been developed. Among them, EXAFS, SEXAFS and NEXAFS based on X-ray absorption have been the research catalysts Domain structure and powerful tool to characterize adsorbed species. In Chapter 8, EXAFS and SEXAFS have been introduced. This chapter introduces the principle of NEXAFS (Near Edge X-Ray Absorption Fine Structure) and its application in catalysis. NEXAFS studies the absorption structure and its characteristics occurring in the region of 50 eV near the absorption edge. The absorption spectrum in this energy range is reflected