Upgrade of a Synchrotron Radiation Beamline for Surface Chemistry

化学研究仪器和设施计划颁发的这一奖项将帮助内布拉斯加大学物理和天文学系的教员升级用于表面化学研究的同步辐射光束线。升级后的光束线将用于研究分子晶体和有序覆盖层中电子能带结构与波矢的函数关系。分子轨道的光电子能谱研究将被用来确定成键机制和分子取向。将在三个主要领域进行研究：1)吸附覆盖层和分子晶体的能带结构的研究；2)角分辨光电子能谱确定的分子取向；3)氧化物表面的化学。大分子晶体阵列用于形成一维导体、有机半导体、非线性光学材料、铁电和光折变材料。分子晶体和聚合物广泛应用于高密度光存储器件和高速光纤通信系统。光折变全息数据存储是基于掺入光导聚合物中的非线性光学分子的电光性质。了解这些材料的电子结构对它们的性能至关重要。用这种升级的光电子能源启动的研究将增强这些研究人员研究此类材料的能力。

This award from the Chemistry Research Instrumentation and Facilities Program will assist faculty in the Department of Physics and Astronomy at the University of Nebraska to upgrade a Synchrotron Radiation Beamline for use in surface chemistry research. The upgraded beamline will be used to study the electronic band structure as a function of wave vector in molecular crystals and ordered overlayers. Photoemission studies of the molecular orbitals will be used to ascertain bond mechanisms and molecular orientation. Research will be conducted in three primary areas: 1) the study of band structures of adsorbate overlayers and molecular crystals; 2) molecular orientation determined by angle resolved photoemission; and 3) the chemistry of oxide surfaces.Crystalline arrays of large molecules are used to form one dimensional conductors, organic semiconductors, nonlinear optical materials, ferroelectric and photorefractive materials. Molecular crystals and polymers are widely used in high density optical storage devices and high speed optical fiber communications systems. Photorefractive holographic data storage is based on the electro-optical properties of nonlinear optical molecules incorporated into photoconductive polymers. An understanding of the electronic structure of these materials is crucial to their performance. Studies initiated with this upgraded photoemission resource will enhance the ability of these investigators to study such materials.