Studies of Phonon-Photon and Electron-Photon Interaction via Incoherent Nuclear Resonant Scattering of Synchrotron Radiation

通过同步辐射的非相干核共振散射研究声子-光子和电子-光子相互作用

• 批准号: 9623684
• 负责人: James Mullen
• 金额: $ 25.5万
• 依托单位: Purdue Research Foundation
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-05-15 至 2000-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9623684&HistoricalAwards=false
• 关键词: Studies; Phonon; Photon; Electron; Interaction

9623684 Mullen This proposal is intended to develop capabilities for meV resolution xray optics that can be used to scan the phonon density of states using the Mossbauer transitions with energies below 30 keV. The technique, which has so far been applied only to 57Fe, will permit the measurement of the density of phonon states for europium and dysprosium compounds. We plan to explicitly carry out such measurements on the high Tc superconductors, as well as multilayer semiconductors containing europium. Using delayed coincidence techniques we propose to measure low-angle Compton scattering, to obtain new information about the Fermi surface of metals. %%% Gamma and x-ray optics is at the forefront of synchrotron radiation. We propose a new two crystal system of x-ray optics that should enhance the energy resolution of synchrotron monochromators by an order of magnitude. This improved technology will make possible precision density of states measurements of lattice vibrations in solids and new approaches to determining the electronic properties of crystalline materials. These techniques will be applied to high temperature superconductors, superlattice semiconductors structures, and especially to crystalline materials that can only be fabricated in millimeter sizes where neutron scattering measurements are not practical. ***

9623684马伦这项提议旨在发展MEV分辨率X射线光学的能力，这种光学可用于使用能量低于30keV的穆斯堡尔跃迁来扫描态的声子密度。这项到目前为止只应用于57Fe的技术，将允许测量Eu和Dy化合物的声子态密度。我们计划在高T_c超导体以及含Eu的多层半导体上进行这种测量。我们提出用延迟符合技术测量低角康普顿散射，以获得有关金属费米表面的新信息。伽马和X射线光学处于同步辐射的前沿。我们提出了一种新的双晶X射线光学系统，它将使同步加速器单色器的能量分辨率提高一个数量级。这一改进的技术将使精确测量固体中晶格振动的态密度成为可能，并将成为确定晶体材料电子性质的新方法。这些技术将应用于高温超导体、超晶格半导体结构，特别是只能制造毫米尺寸的晶体材料，因为在这些材料中，中子散射测量是不可行的。***