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LTP

34-mm long capillary extension (3 mm i .d. ). 1 bar. 2 mbar. He. ~10 mm. Transfer quadrupole. 300-µm inlet orifice. LTP. 500-µm orifice. MS Inlet. Figure S1. Diagram of experimental setup. Drawing is approximately to scale. (H 2 O) 3 H + , Square wave, 10 Hz , 0 kV to 3 kV.

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LTP

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  1. 34-mm long capillary extension (3 mm i.d.) 1 bar 2 mbar He ~10 mm Transfer quadrupole 300-µm inlet orifice LTP 500-µm orifice MS Inlet Figure S1. Diagram of experimental setup. Drawing is approximately to scale.

  2. (H2O)3H+, Square wave, 10 Hz, 0 kV to 3 kV Figure S2. Frequency spectrum of (H2O)3H+ ion signal from a 10-Hz, square-wave LTP from 0 kV to 3 kV. The base peak at 10 Hz indicates that only one plasma pulse occurs per cycle. In contrast, a square wave from -3 kV to +3 kV produced two pulses per cycle.

  3. a) (H2O)3H+, Triangle wave, 10 Hz, -3 kV to 3 kV b) (H2O)3H+, Square wave, 10 Hz, -3 kV to 3 kV (H2O)3H+, Sine wave, 10 Hz, -3 kV to 3 kV (H2O)3H+, Sawtooth wave, 10 Hz, -3 kV to 3 kV c) d) Figure S3. Fourier spectra of (H2O)3H+ ion signal for an LTP powered with a (a) sine, (b) triangle, (c) sawtooth, and (d) square wave. Note, other reagent ions produced similar frequency spectra for each waveform.

  4. Figure S4. Selected-ion chronograms for NO+ (blue), (H2O)3H+ (black), and the MH+ for acetone (red) in the presence of acetone vapor. LTP used in this case was powered with a 10-Hz, 6 kVp-p square-wave. Note that the trace for protonated acetone closely matches the profile for the protonated water cluster.

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