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. 2020 Aug 13;412(26):7131–7140. doi: 10.1007/s00216-020-02846-8

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© The Author(s) 2020

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Fig. 2 — Ion intensities in counts per second (cps) of the water reagent ions (H₃O⁺·(H₂O)_n, n = 0, 1, and 2) and parasitic ions O₂⁺ and NO⁺ present in the DT under dry (a) and humid (b) conditions as a function of RF voltage. DC was 13.5 V/cm and E_drift was 66 V/cm