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. Author manuscript; available in PMC: 2017 Mar 7.
Published in final edited form as: Anal Chem. 2016 Aug 26;88(18):8957–8964. doi: 10.1021/acs.analchem.6b01915

Figure 2.

Figure 2

(A) Agilent tuning mix ion current measured as a function of distance from the entrance to the TW SLIM module at a TW speed of 124 m/s, TW amplitude of 30 V, guard bias of 5 V, RF amplitude of 220 Vpp at 650 kHz, and 2.75 mm gap at 4.00 Torr. Error bars represent standard deviations from triplicate measurements. (B) Total ion current (TIC) was measured over 8 h, and the mass spectrum was obtained by being averaged from 0 to 8 h with the above identical conditions.