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Nanoflow with orifice interface can provide very large signals, but is weak in desolvation and prone to instability. The bottom trace show ~250 nA peak (166 pA/V gain) at SV 800 V. The S/N exceeds 2000:1 averaged 10 msec per point (27 mM formic acid in MeOH/water, 40 nL/min). Without the reaction chamber heated desolvation gas, charge buildup and ion flow pinch-off can result, preventing ion transmission. A low-flow online infusion system was used for these results.
