Auger-Photoelectron Coincidence Studies of Solids and Their Surfaces

小行星9411610 利用同步辐射俄歇-光电子符合谱（APECS）技术研究了金属、半导体和氧化物的芯能级线型和俄歇电子谱。 APECS的增强灵敏度将用于研究清洁和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3 p（4p）芯能级的线形，以获得表面位移和隐藏的分裂。 在非均匀固体中的特定位置的电子性质和相关效应也将通过测量与移动的芯能级重合的芯-价（CVV）俄歇跃迁来研究。 最后，我们将使用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中进行。 本课题组发展了同步辐射俄歇-光电子符合谱，作为固体的一种新的实验探针。 这是对常规俄歇电子或光电子能谱的定性改进。 它具有表面灵敏度高、消除背景信号、谱线锐化等优点，为研究复杂体系的局域电子性质提供了一种新的、独特的方法。 该技术将被用来获得新的信息，在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。 该技术的位点特异性将用于探测固体化合物中不同原子的电子性质。 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，这项技术的独特能力将提供线索的光激发/衰变过程本身。 这项研究的大部分将在布鲁克海文国家实验室的国家同步加速器光源中进行。 ***

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. ***