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Miniaturized Linear Wire Ion Trap Mass Analyzer

Wu, Qinghao, Li, Ailin, Tian, Yuan, Zare, Richard N., Austin, Daniel E.
Analytical chemistry 2016 v.88 no.15 pp. 7800-7806
benzene, capacitance, detection limit, drilling, electric field, photons, toluene
We report a linear ion trap (LIT) in which the electric field is formed by fine wires held under tension and accurately positioned using holes drilled in two end plates made of plastic. The coordinates of the hole positions were optimized in simulation. The stability diagram and mass spectra using boundary ejection were compared between simulation and experiment and good agreement was found. The mass spectra from experiments show peak widths (fwhm) in units of mass-to-charge of around 0.38 Th using a scan rate of 3830 Th/s. The limits of detection are 137 ppbv and 401 ppbv for benzene and toluene, respectively. Different sizes of the wire ion trap can be easily fabricated by drilling holes in scaled positions. Other distinguishing features, such as high ion and photon transmission, low capacitance, high tolerance to mechanical and assembly error, and low weight, are discussed.