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

该提案旨在开发meV分辨率x射线光学的能力，该光学可用于扫描能量低于30 keV的穆斯堡尔跃迁态的声子密度。这项技术目前只应用于57Fe，它将允许测量铕和镝化合物的声子态密度。我们计划明确地对高Tc超导体以及含铕的多层半导体进行这样的测量。我们提出利用延迟重合技术测量低角康普顿散射，以获得金属费米表面的新信息。伽玛和x射线光学处于同步辐射的前沿。我们提出了一种新的x射线光学双晶系统，它可以将同步加速器单色器的能量分辨率提高一个数量级。这种改进的技术将使固体中晶格振动的精确状态密度测量和确定晶体材料电子特性的新方法成为可能。这些技术将应用于高温超导体、超晶格半导体结构，特别是只能在毫米尺寸的晶体材料中制造，而中子散射测量是不切实际的。＊＊＊

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. ***