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. Author manuscript; available in PMC: 2017 Jun 14.
Published in final edited form as: Anal Chem. 2017 Jan 19;89(3):1972–1977. doi: 10.1021/acs.analchem.6b04500

Figure 7.

Figure 7

(a) Ion current measured as a function of the distance from the entrance of TW-SLIM escalator module. Error bars represent standard deviations from triplicate measurements. Measurements were made by inserting a conducting probe in between the two TW-SLIM surfaces at each point. The ~25% decrease at the entrance is attributed to m/z species not effectively transmitted by the SLIM (i.e., the mismatch between the ion injection and the SLIM ranges of optimal ion confinement and transmission). (b) Ion mobility resolution measured as a function of TW speed for a TW amplitude of 30 V, a TW sequence of 11110000, guard bias of 15 V, and rf amplitude (Vp-p) of 320 V for the linear TW-SLIM and TW-SLIM escalator arrangements.