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Schematic of APi-TOF and CI-APi-TOF or ToF-CIMS with different ion sources (a,b). Note that for the nitrate CI-APi-TOF, voltage settings may change depending on application, setup, and users; not all flow tube nitrate sources use the N2 flush as shown in inset in (a). Adapted with permission from ref (36). Copyright 2011 Copernicus Publications. Adapted with permission from ref (236). Copyright 2014 National Academy of Sciences.
