金属表面定量俄歇电子能谱理论研究

In the past few years, developments in both experimental and theoretical studies make it possible for people to get informations about the electronic states as well as the transition processes by investigating the detailed spectral profiles and the spin polarization degree of the Auger electrons emitted from solids and surfaces. Theoretical explanation for these kind of accurate observations needs accurate quantum mechanical descriptions for the electronic wave functions, the transition matrix elements, and the many-body effects. A theoretical model based on the so-called first principle calculations has been developed to give quantitative descriptions for the detailed Auger spectral profiles as well as the spin polarization of the Auger electrons. Changes of the characteristics of the detailed CVV ( core- valence-valence ) Auger spectral profiles across the transition metals have been investigated with special attention to the occurrence of the atomic-like multiplit splitting of the CVV Auger spectra of the full-filled d-band metals, Cu, Zn, and Ag. It was shown that the so-called relaxation effects before and after the Auger transition take an essential rule in the atomic-like features of the CVV Auger spectra of the full-filled d-band transition metals. Reasonable agreement with experiment has been predicted for the spin polarization of the Auger electron emitted from Cr surface induced by a circular polarized excitation light.. Opacity of hot and dense plasmas is a very important and basic quantity widely used in high power laser produced plasma and stellar structure simulations. Large scall numerical calculations is the only major way of obtaining the opacity of hot and dense plasmas and concerns a varity of atomic photon absorption cross sections and spectral line profiles. A lot of approximations were involved in the numerical calculations before, which reduce the reliability of the results considerably. In the past decade, more attentions have been given to the so-called detailed term ( or level ) accounting (DT(L)A) models of the opacity calculations, in order to resolve the influence of the detailed spectral line profiles to the final results. Progress have only been made in a few groups in the developed countries. Independent efforts have been carried out in the past few years in our research group to develop a DT(L)A approach of obtaining the opacity for hot and dense plasmas. Studies for the autoionization and electronic correlation showed that both effects change the transmission of the x-ray through the plasma and the spectral resolved opacity apparently.

由于新光源技术的发展，如同步辐射光的应用对俄歇电子的研究又注入了新的活力。本项目致力于发展一个统一处理固体表面俄歇电子发射的理论、计算方法和程序。理论的建立将基于基本的物质电子结构理论，固体的电子结构利用FLAPW理论和方法，俄歇电子末态用电子驮酉嗷プ饔玫牧枋觥Ｏ钅拷怨山鹗艏鄣缱佣硇捉邢晗秆芯俊