MRI: Development of a hybrid mass spectrometry platform with mass-selective optical spectroscopy of cryogenic ions

该奖项由主要研究仪器和化学研究仪器项目支持。耶鲁大学的马克·约翰逊教授和他的同事詹姆斯·梅尔、斯科特·米勒、帕特里克·霍兰德和尼莱·哈扎里建造了一种新型混合质谱仪。在离子在没有氧气或水的惰性气氛中冷却后，光谱仪能够对离子进行质量选择性分离，以进行光学光谱表征。该提案的目的是使用一种混合方法，其中高分辨率质谱法与光学光谱（如红外光谱）相结合。这项创新的关键在于在通常的离子操作（例如串联质谱）和允许收集光谱的光学光谱仪之间增加了一个低温离子处理阶段。该仪器包括一个封闭的惰性环境，用于离子注入，包括在手套箱中操作样品和低温样品制备，以延长离子稳定性。它被设计为惰性样品轨道阱离子谱联用质谱仪（ISOMSIS）。一般来说，质谱（MS）是用于鉴定和表征嵌入在复杂基质中的少量化学物质的关键分析方法之一。在一个典型的实验中，这些成分流入质谱仪，在那里它们被电离成母离子和母离子的碎片离子，并测量它们的质量。这种高度灵敏的技术可以检测和确定复杂混合物中的分子结构。增加一个腔室，离子可以在分离后冷却，然后插入一个光谱仪，测量光（如红外光）如何与感兴趣的物种相互作用，大大增加了未知化合物和中间体表征的结构特异性。建设一个新的仪器对促进经济发展和培养新一代的仪器工作者是必不可少的。学生参与和建设过程，并使用仪器在推广活动，如耶鲁科学之路。调查人员还展示了这一工具平台在与当地社区的联系和与当地化学工业的联系等活动中所提供的能力。建立这种混合质谱仪的奖励旨在加强各级的研究和教育。它特别影响了研究，研究的方向是酶，氮酶模型化合物，在植物中吸收氮的过程中。该仪器还可用于氧还原反应的研究。此外，它有助于发现催化对映选择反应的小肽，并有助于用地球上丰富的金属制备催化剂，以制造更环保的材料，从而促进经济发展。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

This award is supported by the Major Research Instrumentation and the Chemistry Research Instrumentation programs. Professor Mark Johnson from Yale University and colleagues James Mayer, Scott Miller, Patrick Holland and Nilay Hazari built a new type of mixed mass spectrometer. The spectrometer enables mass-selective isolation of ions for optical spectroscopic characterization after the ions are cooled in a chamber having an inert atmosphere without oxygen or water. The aim of the proposal is to use a hybrid approach in which high resolution mass spectrometry is integrated with optical spectroscopies, such as infrared. The key to this innovation derives from the addition of a cryogenic ion processing stage between the usual ion manipulations (for example, tandem mass spectrometry) and the optical spectrometers that allow the collection of spectra. The instrument includes incorporation of an enclosed, inert environment for ion injection that include sample manipulation in a glovebox and low temperature sample preparation to prolong the ion stability. It is designed as an inert sample orbitrap mass spectrometer with ion spectroscopy (ISOMSIS). In general, mass spectrometry (MS) is one of the key analytical methods used to identify and characterize small quantities of chemical species embedded in complex matrices. In a typical experiment, the components flow into a mass spectrometer where they are ionized into the parent ion and its fragment ions and their masses are measured. This highly sensitive technique allows detection and determination of the structure of molecules in a complex mixture. The addition of a chamber where the ions can be cooled after separation followed by insertion into a spectrometer that measure how light (such as infrared light) interacts with species of interest substantially increases the structural specificity in characterization of unknown compounds and intermediates. The building a new instrumentation is essential to improve economic development and to prepare the new generation of instrumentalists. Students participate and the building process and use the instrument in outreach activities such as that Yale Pathways to Science. The investigators also demonstrate the capabilities afforded by this instrumental platform in activities ranging from outreach to the local community and connections to local chemical industry.The award to build this mixed mass spectrometer is aimed at enhancing research and education at all levels. It especially impacts studies directed to study research is directed to the enzyme nitrogenase model compounds in processes that incorporate nitrogen in plants. The instrument is also used for investigations of the oxygen reduction reaction. In addition, it aids in the discovery of small peptides that catalyze enantioselective reactions, and in the preparation of catalysts with earth-abundant metals to make more environmentally friendly materials that will improve economic development.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.