Structure, Phase Transitions, and Dynamics of Adsorbed Films

9314235 TOUB技术摘要：建议对吸附薄膜进行中子和X射线散射实验，以解决当前表面物理感兴趣的各种问题：1)确定最简单的(稀有气体)薄膜的多层结构和生长模式，以及吸附在固体衬底上的较复杂的碳氢薄膜的多层结构和生长模式；2)阐明分子空间位阻性质在吸附薄膜的扩散运动、生长动力学和相变中的作用。实验将在密苏里大学研究反应堆(中子扩散)和布鲁克海文国家同步辐射光源(X射线衍射)进行。非技术摘要：对金属表面有机薄膜结构的微观理解是催化、润滑和粘合技术的基础。为此，建议用中子和X射线实验来研究最简单的(稀有气体)膜的逐层结构和生长，然后是吸附在固体表面上的更复杂的碳氢膜。将分析准弹性中子散射，以确定分子大小和形状对吸附的碳氢分子运动的影响。实验将在密苏里大学研究反应堆和国家同步加速器光源进行。***

9314235 Taub Technical abstract: Neutron and x-ray scattering experiments on adsorbed films are proposed to address a variety of problems of current interest in surface physics: 1) determination of the multilayer structure and growth mode of the simplest (rare gas) films as well as that of more complex hydrocarbon films adsorbed on solid substrates; 2) elucidation of the role of molecular steric properties in the diffusive motion, growth kinetics, and phase transitions of adsorbed films. Experiments will be conducted at the University of Missouri Research Reactor (neutron diffaction) and at the National Synchrotron Light Source, Brookhaven (x-ray diffraction). Non-technical abstract: A microscopic understanding of the structure of organic films on metal surfaces is fundamental to the technology of catalysis, lubrication, and adhesion. Toward this end, neutron and x-ray experiments are proposed to investigate the layer-by-layer structure and growth of the simplest (rare gas) films and then of more complex hydrocarbon films adsorbed on solid surfaces. Quasielastic neutron scattering will be analyzed to determine the effect of molecular size and shape on the motion of adsorbed hydrocarbon molecules. Experiments will be conducted at the University of Missouri Research Reactor and the National Synchrotron Light Source. ***