Acquisition of a High Resolution Mass Spectrometer for Materials Characterization and Education

这份来自材料研究仪器项目和固态化学项目的合同将帮助西北大学获得具有电子冲击（EI）和液体二次离子质谱（LSIMS）电离源的高分辨率磁扇区质谱仪。该仪器将用于表征广泛的材料科学化合物，如介孔超分子分子，卟啉类，用于电子器件结构的新型分子物种和其他大环材料。随着这项研究向更大更复杂的物种发展，内部最先进的质谱仪器的可用性对于这些分子的表征变得至关重要。所要求的仪器将在几个方面提高内部分子表征的质谱分析能力：(1)电子冲击（EI）或LSIMS电离的高分辨率质谱分析灵敏度的提高对于确定这些物种的元素组成至关重要；(2) LSIMS电离质谱法质量范围的增加将允许对高分子量物种进行低分辨率和高分辨率的表征，随着东北大学研究项目的进展，高分子量物种的分子量将继续增加；(3)对空气敏感的材料可以进行表征，而不必担心在运送到另一个实验室时分解。这份来自材料研究仪器项目和固态化学项目的合同将帮助西北大学（NU）获得一台高分辨率磁扇区质谱仪，该质谱仪具有电子冲击和液体二次离子质谱电离源，并具有合适的样品入口，可用于挥发性和纯度范围广的化合物。该仪器将对化学系材料研究中的分子表征工作有重要的帮助。目前，这种鉴定是通过将样品送到外部实验室来完成的。使用所要求的仪器进行内部表征将有利于北大的研究和教育工作。所需的内部分析仪器的可用性将大大增加研究生对现代分析技术的接触。除了对所合成的材料有更完整的描述外，学生还将对分析所用的技术、选择不同电离技术的原因以及从分析中收集的质谱的准确解释有更深入的了解。

This award from the Instrumentation for Materials Research Program and the Solid-State Chemistry Program will help Northwestern University with the acquisition of a high-resolution magnetic-sector mass spectrometer with electron impact (EI) and liquid secondary ion mass spectrometry (LSIMS) ionization sources. This instrument will be used to characterize a wide range of materials science compounds such as mesoporous supramolecular molecules, porphyrazines, novel molecular species for electronic device structure, and other macrocyclic materials. As this research has moved toward larger and more complex species, the availability of in-house state-of- the-art mass spectrometry instrumentation has become essential for characterization of these molecules. The requested instrument will improve on the mass spectrometry capabilities for in-house molecular characterization in several ways: (1) the increased sensitivity for high-resolution mass spectrometry with either electron impact (EI) or LSIMS ionization is essential for determination of elemental composition of these species; (2) the increased mass range for mass spectrometry with LSIMS ionization will allow both low- and high-resolution characterization of the higher molecular weight species which will continue to increase in molecular weight as the research programs at NU progress; (3) air-sensitive materials may be characterized without fear of decomposition during transit to another laboratory.This award from the Instrumentation for Materials Research Program and the Solid-State Chemistry Program will help Northwestern University (NU) with the acquisition of a high-resolution magnetic-sector mass spectrometer with electron impact and liquid secondary ion mass spectrometry ionization sources and with appropriate sample inlets for compounds with a wide range of volatility and purity. This instrument will be a significant benefit to molecular characterization in the materials research efforts in the Chemistry Department. Currently such characterization is done by sending samples to external laboratories. In-house characterization with the requested instrument will benefit both the research and the educational efforts at NU. The availability of the requested instrument for in-house analysis will increase significantly the exposure of graduate students to modern analytical techniques. In addition to gaining a more complete characterization of the materials that they have synthesized, students also will gain a deeper understanding of the techniques used for the analysis, the reason for choosing different ionization techniques, and the accurate interpretation of the mass spectra gathered from this analysis.