Upgrade of a Synchrotron Radiation Beamline for Surface Chemistry

用于表面化学的同步辐射束线升级

• 批准号: 9808022
• 负责人: Peter Dowben
• 金额: $ 7.53万
• 依托单位: University of Nebraska-Lincoln
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-08-01 至 1999-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9808022&HistoricalAwards=false
• 关键词: Upgrade; Synchrotron; Radiation; Beamline; Surface

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.

化学研究工具和设施计划的奖项将协助内布拉斯加州大学物理与天文学系的教师升级用于表面化学研究的同步辐射光束线。 升级的光束线将用于研究电子带结构，这是分子晶体和有序叠加仪中波矢量的函数。 分子轨道的光发射研究将用于确定键机理和分子取向。 研究将在三个主要领域进行：1）对吸附物叠加剂和分子晶体的带结构的研究； 2）通过角度分辨光发射确定的分子取向； 3）氧化物表面的化学性质。大分子的晶体阵列用于形成一维导体，有机半导体，非线性光学材料，铁电和光膜片材料。 分子晶体和聚合物被广泛用于高密度的光储器和高速光纤通信系统。 光赋予全息数据存储基于掺入光导电聚合物中的非线性光学分子的电光特性。 对这些材料的电子结构的理解对于它们的性能至关重要。 从这种升级的光发射资源开始的研究将增强这些研究者研究此类材料的能力。