Blase Ryan C, Miller Greg, Westlake Joseph, Brockwell Tim, Ostrom Nathaniel, Ostrom Peggy H, Waite J Hunter
Southwest Research Institute, 6220 Culebra Road, San Antonio, Texas 78238, USA.
The Johns Hopkins University Applied Physics Laboratory LLC, 11100 Johns Hopkins Road, Laurel, Maryland 20723, USA.
Rev Sci Instrum. 2015 Oct;86(10):105105. doi: 10.1063/1.4932184.
A compact E × B mass spectrometer is presented. The mass spectrometer presented is termed a "perfect focus" mass spectrometer as the resolution of the device is independent of both the initial direction and energy of the ions (spatial and energy independent). The mass spectrometer is small in size (∼10.7 in.(3)) and weight (∼2 kg), making it an attractive candidate for portability when using small, permanent magnets. A multi-collector Faraday cup design allows for the detection of multiple ion beams in discrete collectors simultaneously; providing the opportunity for isotope ratio monitoring. The mass resolution of the device is around 400 through narrow collector slits and the sensitivity of the device follows expected theoretical calculations of the ion current produced in the electron impact ion source. Example mass spectra obtained from the cycloidal focusing mass spectrometer are presented as well as information on mass discrimination based on instrumental parameters and isotope ratio monitoring of certain ion signals in separate Faraday cups.
本文介绍了一种紧凑型E×B质谱仪。所介绍的质谱仪被称为“完美聚焦”质谱仪，因为该设备的分辨率与离子的初始方向和能量均无关（空间和能量独立）。该质谱仪尺寸小（约10.7英寸(3)）、重量轻（约2千克），使其在使用小型永磁体时成为具有吸引力的便携候选设备。多收集器法拉第杯设计允许同时在离散收集器中检测多个离子束；为同位素比率监测提供了机会。通过狭窄的收集器狭缝，该设备的质量分辨率约为400，并且该设备的灵敏度符合电子轰击离子源中产生的离子电流的预期理论计算。展示了从摆线聚焦质谱仪获得的示例质谱图，以及基于仪器参数的质量歧视信息和在单独法拉第杯中对某些离子信号的同位素比率监测。
