MRI-R2: Development of a Scanning Tunneling Microscope for Optical Spectroscopy

0960211LonerganU.技术摘要：该奖项由2009年美国复苏和再投资法案（公法111-5）资助。具有纳米级空间分辨率的光谱表征能力对于基于纳米级和分子材料的新技术的开发至关重要。然而，目前可用的技术往往受到诸如空间分辨率低（光谱法）、缺乏化学特异性/光谱分辨率（电流-电压光谱法）以及缺乏对实验的局部纳米级环境的控制等因素的限制。该提案旨在开发一种扫描隧道显微镜（STM），能够实现一系列新颖的基于STM的光谱学，其空间分辨率可达原子尺度。新型STM仪器的设计独特地结合了低温超高真空STM的原子级稳定性和清洁度，以及STM结发射光子的高收集效率（高达35%）。新的STM将允许原子尺度的调查与分子，聚合物和离聚物系统中的电荷和能量转移相关的广泛的基本问题;通过纳米结构的电荷传输;纳米结构的光学性质;和催化。该仪器将被安置在俄勒冈州的先进材料表征中心，这是一个共享的用户设施，为俄勒冈州和太平洋西北部的研究社区提供服务。该仪器的广泛使用将增加整个俄勒冈州物理、化学和材料科学的研究和教育机会。新的STM所获得的数据在视觉上具有吸引力和说明性，这将使其成为课堂教学以及学生招募和推广活动的一个非常有效的工具。非技术摘要：该奖项是根据2009年美国复苏和再投资法案（公法111-5）资助的。扫描探针显微镜是一种多样化的成像技术，已被证明是非常宝贵的纳米材料的基本性质的调查。扫描隧道显微镜（STM）就是这样一个例子，一种能够以原子分辨率成像的仪器。然而，传统的STM技术仅提供关于样品的局部化学结构和光学性质的有限信息。本提案旨在开发一种STM仪器，该仪器具有独特的分析能力，通过一系列新颖的基于STM的光学光谱技术实现，这些技术将能够提供有关样品的局部化学和电子结构的详细信息。这些新的光学光谱技术是由一种新颖的STM设计，提供高的光收集效率。除了对新材料进行高分辨率光谱表征外，新的STM还将允许研究与分子、聚合物和纳米级系统中的电荷和能量转移相关的各种重要过程;威尔斯化学反应和催化中的键的形成。该仪器将被安置在俄勒冈州的先进材料表征中心，这是一个共享的用户设施，为俄勒冈州和太平洋西北部的研究社区提供服务。该仪器的广泛使用将增加整个俄勒冈州物理、化学和材料科学的研究和教育机会。新的STM所获得的数据在视觉上具有吸引力和说明性，这将使其成为课堂教学以及学生招募和推广活动的一个非常有效的工具。

0960211LonerganU. of Oregon EugeneTECHNICAL ABSTRACT: This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5). The ability for spectroscopic characterization with nanoscale spatial resolution is crucial for the development of novel technologies based on nanoscale and molecular materials. However, currently available techniques are often limited by such factors as low spatial resolution (optical spectroscopies), lack of chemical specificity/spectral resolution (current-voltage spectroscopies), and lack of control over the local nanoscale environment of the experiment. This proposal aims to develop a Scanning Tunneling Microscope (STM) capable of a range of novel STM-based optical spectroscopies with spatial resolution down to the atomic scale. The design of the new STM instrument uniquely combines the atomic-scale stability and cleanliness of a cryogenic Ultra-High Vacuum STM, with high collection efficiency (up to 35%) of photons emitted from the STM junction. The new STM will allow atomic-scale investigations of a wide range of fundamental problems associated with charge and energy transfer in molecular, polymer and ionomer systems; charge transport through nanostructures; optical properties of nanostructures; and catalysis. The instrument will be housed in the Center for Advanced Materials Characterization in Oregon, a shared user facility that serves the research community in Oregon and the Pacific Northwest. The wide availability of the instrument will enhance research and educational opportunities in physics, chemistry and materials science throughout Oregon. The visually compelling and illustrative nature of the data obtained by the new STM will make it a highly effective tool for classroom instruction as well as student recruitment and outreach activities. NON-TECHNICAL ABSTRACT: This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5). Scanning Probe Microscopy is a diverse family of imaging techniques that have proven to be invaluable in investigations of fundamental properties of nanoscale materials. A Scanning Tunneling Microscope (STM) is one such example, an instrument capable of imaging with atomic resolution. However, conventional STM techniques provide only limited information about the local chemical structure and optical properties of the sample. The present proposal aims to develop an STM instrument with unique analytical capabilities enabled by a range of novel STM-based optical spectroscopic techniques that will be able to provide detailed information about the local chemical and electronic structures of the sample. These new optical spectroscopic techniques are made possible by a novel STM design that affords high light collection efficiency. In addition to the high-resolution spectroscopic characterization of new materials, the new STM will allow investigations of a wide range of fundamentally important processes associated with charge and energy transfer in molecular, polymer and nanoscale systems; as wells as formation of bonds in chemical reactions and catalysis. The instrument will be housed in the Center for Advanced Materials Characterization in Oregon, a shared user facility that serves the research community in Oregon and the Pacific Northwest. The wide availability of the instrument will enhance research and educational opportunities in physics, chemistry and materials science throughout Oregon. The visually compelling and illustrative nature of the data obtained by the new STM will make it a highly effective tool for classroom instruction as well as student recruitment and outreach activities.