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Mass spectrum (top) and total ion trace (bottom) obtained for a 1 μM leucine enkephalin solution in 99.9:0.1 (v:v) water:acetic acid in RF-only ionization mode (0 VDC charging potential). An AMUSE chip with 3-μm nozzles was used. Operating conditions: 40 μL min-1 liquid flow rate, 7.2 L min-1 N2, QiT detection.
