U.S.-France Cooperative Research: Synchrotron Radiation Compton Scattering Studies

该奖项将支持斯坦福大学同步辐射实验室(SSRL)的Arthur Bienenstock教授与巴黎大学矿物晶体实验室的Genevive Loupias博士和Jerome Tarbes博士之间的合作研究，在高强度X射线康普顿散射领域。这项工作的目的是利用同步辐射从SSRL的PEP存储环上的束线发出的高强度X射线，利用康普顿散射进行非常高分辨率的电子动量密度测量。要实现这一目标，需要设计和建造一种能量色散探测装置，以便在接近散射X射线的能量下进行探测；通过对以前研究的材料的测量，以比以前可能的更高的分辨率对该仪器进行校准；最后，对居里温度上下的过渡金属等复杂系统的研究。法国合作者在高分辨率康普顿散射方面拥有丰富的经验，这应该可以确保SSRL设施在相对较短的时间内为这些测量配备设备。安装探测器后，美国和法国的小组将研究不同的材料：美国小组将研究元素半导体和金属，而法国小组将研究天然和人造层状结构。这两个小组将联合分析所获得的结果，尽管将在SSRL进行测量，但一些数据分析将在法国进行。这项研究将推进康普顿散射本身的技术，并将为整个科学界提供高分辨率散射测量的资源。

This award will support collaborative research between Prof. Arthur Bienenstock of the Stanford Synchrotron Radiation Laboratory (SSRL), and Drs. Genevieve Loupias and Jerome Tarbes of the Laboratoire de Mineralogie-Crystallographie of the Universite de Paris, in the area of high-intensity X-ray Compton scattering. The objective of this work is to utilize the high-intensity X-rays emitted by synchrotron radiation from the beam lines on the PEP storage ring at SSRL to perform very high resolution electron momentum density measurements using Compton scattering. Achievement of this objective requires design and construction of an energy-dispersive detection apparatus optimized for detection at energies near that of the scattered X-rays; calibration of this apparatus by measurements on previously studied materials at higher resolution than has been previously possible; and, finally, the study of complex systems such as the transition metals above and below the Curie temperature. The French collaborators have considerable experience with high-resolution Compton scattering, which should assure that the SSRL facilities are equipped for these measurements in a relatively short time. Following the installation of the detectors, the U.S. and French groups will study different materials: the U.S. group will investigate elemental semiconductors and metals, while the French group will study both natural and artificial layered structures. The two groups will jointly analyze the results obtained, and although measurements will be made at SSRL, some data analysis will take place in France. The research will advance the technique of Compton scattering itself, and will provide a resource for high-resolution scattering measurements to the scientific community at large.