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. Author manuscript; available in PMC: 2021 Feb 10.
Published in final edited form as: Mass Spectrom Rev. 2019 Sep 6;39(4):336–370. doi: 10.1002/mas.21601

Figure 2.

Figure 2.

Schematic for paper spray. Experiments show that when solvent is first applied to the paper and readily available, ESI mode results in large droplets and lower spray currents. As time progresses, APCI mode results in smaller diameter droplets and larger spray currents, possibly accessing alternative ionization routes.