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A high-transmission axial ion mobility classifier for mass–mobility measurements of atmospheric ions
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A high-transmission axial ion mobility classifier for mass–mobility measurements of atmospheric ions
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A high-transmission axial ion mobility classifier for mass–mobility measurements of atmospheric ions
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Journal Article
A high-transmission axial ion mobility classifier for mass–mobility measurements of atmospheric ions
2022
Overview
We present an electrical mobility classifier for mass–mobility
measurements of atmospheric ions. Size segregation coupled with mass
spectrometric detection of naturally occurring ions in the atmosphere is
challenging due to the low ion concentration. Conventional electrical
mobility classifying devices were not yet coupled with mass spectrometry to
resolve natural ion composition. This is due to either the insufficient
transmission efficiency or design concepts being incompatible with this
application, e.g. using high electric fields close to the inlets to push
ions from high to low electric potential. Here, we introduce an axial ion
mobility classifier, termed AMC, with the aim to achieve higher transmission
efficiencies to segregate natural ions at reasonable sizing resolution.
Similar to the recently introduced principle of the high-pass electrical
mobility filter (HP-EMF) presented by Bezantakos et al. (2015) and Surawski
et al. (2017), ions are classified via an electric field that is opposed to
the gas flow direction carrying the ions. Compared to the HP-EMF concept, we make use of sheath flows to improve the size resolution in the sub-3 nm
range. With our new design we achieve a sizing resolution of 7 Z/ΔZ with a transmission efficiency of about 70 %.
