Studies of Physical Adsorption

成立新材料研究组， 物理吸附和相变的基本方面 在物理吸附薄膜中。 研究的目的是研究 物理吸附膜的结构和动力学， 这些阶段的性质以及它们之间的过渡。 的 研究分为五个方面：（1）单分子膜的熔化 石墨上的氩膜，（2）薄膜的相变， 二元吸附质，（3）井中简单气体的性质- 特征沸石多孔介质，（4）不寻常的性质， 在弱结合衬底上的单层和多层氦膜， (5)膜的解吸和氦原子散射。 实验 这些努力包括测量热容量、原位蒸汽 压力等温线研究，氦非弹性散射，高- 分辨低能电子衍射，非弹性氦原子 散射，中子散射，飞行时间解吸 测量，润湿和超流体研究。 分子 动力学计算机模拟被用来提供逼真的 吸附物行为和相变的模拟 薄膜和受限流体。 原子-表面相互作用势 散射以及吸附质的经典跃迁和量子跃迁 系统正在研究的理论推力的 使用势能模型和统计力学的程序 接近。 实验、计算 模拟和理论正在使进步不可能， 孤立的方法。

A new Materials research Group is established to investigate fundamental aspects of physical adsorption and phase transitions in physisorbed films. The goals of the research are to study both the structure and kinetics of physisorbed films, and the nature of these phases and the transitions between them. The research is organized into five topics: (1) melting of monolayer argon films on graphite, (2) phase transitions of films of binary adsorbates, (3) properties of simple gases in a well- characterized zeolite porous medium, (4) unusual properties of monolayer and multilayer helium films on weak-binding substrates, (5) desorption and helium atom scattering of films. Experimental efforts include measurement of heat capacity, in-situ vapor pressure isotherm study, inelastic helium scattering, high- resolution low-energy electron diffraction, inelastic helium scattering, neutron scattering, time-of-flight desorption measurements, and wetting and superfluid studies. Molecular dynamics computer simulation is being used to provide realistic modelling of adsorbate behavior and phase transitions of thin films and confined fluids. Interaction potentials, atom-surface scattering, and classical and quantum transitions of adsorbate systems are being studied in the theoretical thrusts of the program using potential energy models and statistical mechanics approaches. The strong coupling of experiment, computational simulation and theory are making advances not possible by isolated approaches.