UV Spectroscopy of Metal-Organic Molecular Beam Epitaxy (MOMBE)

这笔拨款用于购买紫外光谱系统，用于研究化学束外延生长的化学和热力学。紫外光谱是一种强大的科学工具，最适合研究化学束外延的生长过程。本提案中描述的设备将创建紫外吸收光谱和激光诱导荧光光谱的能力。这两种技术将用于研究III-V型半导体和合金的外延生长。与使用元素源的分子束外延不同，化学束外延使用气体源（金属有机物和氢化物）。因此，外延生长的化学动力学更复杂，但比在MBE中更容易测量。有了本建议中所要求的设备，就有可能通过探测基板上方的区域来获得定量的化学信息。该设备可以提供有关分子和原子种类的浓度和电子状态的信息。本提案中描述的紫外光谱所需的设备类型不能从任何供应商处作为单个单元获得，为了进行此类研究，有必要组装适当的单个组件。

This grant if for the purchase of an ultra-violet spectroscopy system for research on the chemistry and thermodynamics of epitaxial growth by chemical beam epitaxy in-situ and in real time. UV spectroscopy is a powerful scientific tool that is best suited for the study of growth processes by chemical beam epitaxy. The equipment described in this proposal will create the capability for UV absorption spectroscopy and laser-induced fluorescence spectroscopy. These two techniques will be used for the investigation of epitaxial growth of III-V semiconductor and alloy microstructures. In contrast to molecular beam epitaxy in which elemental sources are used, gas sources (metal- organics and hydrides) are used in chemical beam epitaxy. Consequently the chemical dynamics of epitaxial growth are more complex, but easier to measure than is the case in MBE. With the equipment requested in this proposal, it will be possible to obtain quantitative chemical information by probing the region just above the substrate. This equipment can provide information about the concentrations and electronic states of molecular and atomic species. The type of equipment needed for the UV spectroscopy described in this proposal is not available as a single unit from any supplier, and in order to perform such studies, it is necessary to assemble appropriate individual components.