Studies of the Structure, Phase Transitions, and Dynamics ofAdsorbed Films

这项研究涉及到表面物理学中当前感兴趣的各种问题的研究。这包括：1)研究最简单（稀有气体）薄膜的多层结构以及分子单层中的新结构；2)观察准二维分子固体中的集体振动激发及其分析，以推断分子间和分子底物的相互作用；3)研究吸附膜的相变，这些相变要么不会发生在大块固体中，要么在低维条件下理论上更容易实现。实验将使用非弹性和准弹性中子散射来研究单层动力学，并使用弹性中子衍射和同步加速器x射线散射来探测薄膜结构。

This research is concerned with the study of a variety of problems of current interest in surface physics. These include: 1) the study of the multilayer structure of the simplest (rare gas) films as well as novel structures in molecular monolayers; 2) the observation of collective vibrational excitations in quasi-two-dimensional molecular solids and their analysis to infer intermolecular and molecule substrate interactions; and 3) the study of phase transitions in adsorbed films which either do not occur in bulk solids, or which may be more tractible theoretically in low dimensions. The experiments will employ inelastic and quasielastic neutron scattering to investigate monolayer dynamics and both elastic neutron diffraction and synchrotron x-ray scattering to probe film structure.