High Resolution Crystallographic Studies (Chemistry)

在科彭斯博士的指导下进行的研究将广泛利用国家同步加速器光源和康奈尔高能同步加速器源的同步辐射设施。主要的工作将集中在调制固体的结构分析上，其中通过无公度调制波的叠加来改变三维对称性。这样的调制可以强烈地影响物理性质，如导电性。此外，科彭斯博士还将进一步发展他在纽约州立大学布法罗分校的实验室进行低温测量的实验能力。这种能力将使初步测量能够以更系统的方式进行，从而补充同步加速器设施的工作。这项关于分子晶体中电子密度和相变的研究活动有望在几个领域提供新的基本见解。特别是对电导性和超导电性的认识还不完全。这些研究可能会影响寻找用于电子设备或高温超导体的新材料。

The research under the direction of Dr. Coppens will make extensive use of the synchrotron radiation facilities at the National Synchrotron Light Source and at the Cornell High Energy Synchrotron Source. A major effort will focus on the structural analysis of modulated solids, in which the three-dimensional symmetry is modified by superposition of incommensurate modulation waves. Such modulations can strongly affect physical properties such as electrical conductivity. In addition Dr. Coppens will develop further the experimental capability of his laboratory at SUNY-Buffalo to carry out low temperature measurements. This capability will complement the work at the synchrotron facilities by permitting preliminary measurements to be carried out in a more systematic manner. This research activity on electron densities and phase transitions in molecular crystals is expected to provide new fundamental insights in several areas. In particular, the understanding of electrical conductivity and superconductivity is still not complete. These studies could impact the search for new materials for electronic devices or for high temperature superconductors.