Skip to main content
. Author manuscript; available in PMC: 2023 Nov 9.
Published in final edited form as: Atmos Chem Phys. 2022 Nov 9;22(21):14377–14399. doi: 10.5194/acp-22-14377-2022

Figure 2.

Figure 2.

(a) Negligible parent ion fragmentation (with high signal-to-noise ratios) across diverse chemical functionalities in CI-ToF allows for measurements of understudied chemical species (examples from authentic standards shown). (b) Average ToF mass spectra obtained from NH4+ and H3O+ (i.e. PTR) ionization schemes binned over 10 m/z intervals using data from the same Vocus CI-ToF at the site. The CI-ToF spectra observed greater ion signal in the approximate intermediate-volatility into the semi-volatile region (e.g., ≥160 m/z). Note: In (b), the NH4+ and PTR signals are offset by 18 and 1 m/z respectively to account for the difference in the mass of the reagent ion and the averages are from different days when the reagent ion was switched.