Auger-Photoelectron Coincidence Studies of Solids and Their Surfaces

固体及其表面的俄歇光电子符合研究

• 批准号: 9411610
• 负责人: Robert Bartynski
• 金额: $ 24万
• 依托单位: Rutgers University New Brunswick
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-08-15 至 1998-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9411610&HistoricalAwards=false
• 关键词: Auger; Photoelectron; Coincidence; Studies; Solids

9411610 Bartynski A technique of Auger-photoelectron coincidence spectroscopy (APECS) with synchrotron radiation will be employed to study the core level line shapes and Auger electron spectra in selected metals, semiconductors and oxides. The enhanced sensitivity of APECS will be used to study the core level shifts, charge transfer, and electronic structure at the clean and adsorbate covered surfaces. With the ability of APECS to eliminate lifetime broadening, we will probe the line shapes of 3p (4p) core levels in several 3d (4d) transition metals for surface shifts and hidden splittings. Site- specific electronic properties and correlation effects in inhomogeneous solids will also be studied by measuring core-valence (CVV) Auger transitions coincidence with shifted core levels. Finally, we will use the unique capabilities of APECS to explore the photoexcitation/decay process itself. The majority of the research will be performed at the National Synchrotron Light Source of Brookhaven National Laboratory. Our group has developed Auger-photoelectron coincidence spectroscopy using synchrotron radiation as a new experimental probe of solids. This is a qualitative improvement over conventional Auger electron or photoelectron spectroscopy. It is more surface sensitive, it eliminates background signal, it sharpens spectral lines, and it provides a new and unique way to study the local electronic properties of complicated systems. The technique will be utilized to obtain new information about the electronic structure and bonding at clean and adsorbate covered semiconductor and metal surfaces. The site-specific nature of the technique will be used to probe the electronic properties of different atoms in solid compounds. The sharper spectral lines will allow new ways to investigate magnetic effects and electronic interactions in solids. Finally the unique capabilities of this technique will provide clues to the photoexcitation/decay process itself. The ma jority of the research will be performed at the National Synchrotron Light Source of Brookhaven National Laboratory. ***

本文将采用同步辐射的俄歇-光电子符合谱（APECS）技术研究选定金属、半导体和氧化物中的核心能级线形状和俄歇电子能谱。APECS增强的灵敏度将用于研究干净表面和被吸附物覆盖表面的芯能级位移、电荷转移和电子结构。利用APECS消除寿命展宽的能力，我们将探测几种3d （4d）过渡金属中3p （4p）核心能级的线形，以研究表面移位和隐藏分裂。在非均质固体中，位点特异性电子特性和相关效应也将通过测量与移核能级重合的核价（CVV）俄热跃迁来研究。最后，我们将利用APECS的独特功能来探索光激发/衰变过程本身。大部分研究将在布鲁克海文国家实验室的国家同步加速器光源进行。本课组利用同步辐射开发了一种新的固体实验探针——俄歇-光电子符合谱。与传统的俄歇电子或光电子能谱相比，这是一个质的改进。它具有更高的表面灵敏度、消除背景信号、锐化谱线等优点，为研究复杂系统的局部电子性质提供了一种新的、独特的方法。该技术将用于获取有关清洁和吸附物覆盖的半导体和金属表面的电子结构和键合的新信息。该技术的位置特异性将用于探测固体化合物中不同原子的电子特性。更清晰的光谱线将为研究固体中的磁效应和电子相互作用提供新的方法。最后，该技术的独特能力将为光激发/衰变过程本身提供线索。大部分研究将在布鲁克海文国家实验室的国家同步加速器光源进行。＊＊＊