Articles | Volume 9, issue 6
https://doi.org/10.5194/amt-9-2709-2016
https://doi.org/10.5194/amt-9-2709-2016
Research article
 | 
29 Jun 2016
Research article |  | 29 Jun 2016

A new high-transmission inlet for the Caltech nano-RDMA for size distribution measurements of sub-3 nm ions at ambient concentrations

Alessandro Franchin, Andy Downard, Juha Kangasluoma, Tuomo Nieminen, Katrianne Lehtipalo, Gerhard Steiner, Hanna E. Manninen, Tuukka Petäjä, Richard C. Flagan, and Markku Kulmala

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Short summary
High transmission efficiency is key for classifying and counting atmospheric aerosol below 10 nm. We developed a new high­-transmission inlet for the Caltech nano-­radial DMA (nRDMA) and successfully deployed the nRDMA, equipped with the new inlet, in chamber measurements, using a particle size magnifier (PSM) and a booster CPC as a counter. With this setup, we were able to measure size distributions of ions between 1.3 and 6 nm in mobility diameter.