Development of a Novel Laboratory Instrument for Studying Gas-Phase Negative Ion Chemistry

在化学研究仪器和设施-仪器开发（CRIF-ID）计划的支持下，哥伦比亚大学天体物理实验室的Daniel Savin将开发一种新的仪器来研究气相，阴离子中性反应，这是对现有方法的补充，从而填补了一个重要的空白。PI将使用快速合并的阴离子中性光束来探测带电的最终产物。这种新颖的研究仪器将结合最先进的实验室方法，以一种目前在其他地方无法获得的独特安排，并将增加新的功能，允许检测分离的产品电子。未来的扩展将允许直接检测产品阴离子。实验室束流能量将在keV范围内；但由于光束是共线性的，因此可以实现meV到keV范围内的质心能量。PI将能够以20%的精度测量绝对反应截面。该仪器将首次使用快速合并光束来研究阴离子中性反应，并首次探测到合并光束排列中的分离电子。这台仪器将在许多领域产生影响，包括天体物理学、物理化学、质谱，甚至可能在更遥远的学科，如物理有机化学和环境化学。因此，从科学和教育的角度来看，它为科学界的不同人群提供服务。

With support from the Chemistry Research Instrumentation and Facilities - Instrument Development (CRIF-ID) Program, Daniel Savin in the Astrophysics Laboratory at Columbia University will develop a new instrument for studying gas-phase, anion-neutral reactions which complements the existing methods, thereby filling an important niche. The PI will use fast, merged anion-neutral beams and detect the charged end products. This novel research instrument will combine state-of-the-art laboratory methods in a unique arrangement not currently available elsewhere and will add new capabilities allowing for the detection of detached product electrons. Future extensions will allow direct detection of the product anions. Laboratory beam energies will be in the keV range; but because the beams run co-linear, center-of-mass energies from the meV to keV range can be achieved. The PI will to be able to measure absolute reaction cross sections with an accuracy of " 20%. This instrument will represent the first use of fast, merged beams to study anion-neutral reactions and the first detection of detached electrons from a merged beams arrangement. This instrument will have impact in a large number of fields, including astrophysics, physical chemistry, mass spectrometry and even possible in more remote disciplines, such as physical organic and environmental chemistry. Thus, it serves a diverse population of the scientific community from a scientific and education standpoint.