Science Advances

Supplementary Materials

This PDF file includes:

  • fig. S1. Ion cluster formation rates.
  • fig. S2. Time of sunset and beginning and event peak times for each of the 25 events.
  • fig. S3. Naturally charged HOM dimers and trimers.
  • fig. S4. Naturally charged HOM monomers.
  • fig. S5. Sulfuric acid concentration.
  • fig. S6. Non-nitrate and organonitrate HOM dimers.
  • fig. S7. Conditions favoring HOMs production and subsequent ion cluster formation.
  • fig. S8. Evolution of the APi-TOF TIC during the course of the measurement campaign.
  • table S1. Relationship between the observations of the ion and mass spectrometers.
  • table S2. Characterization of the active cluster formation period.
  • table S3. Subsets of compounds representative of non-nitrate and organonitrate HOM dimers.

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