ICARUS Chamber Experiment: Nguyen Group_20220603_(+)-D-3-Carene/Ammonium Sulfate/Ozone/Hydrogen Peroxide_Ozone_Ammonium sulfate

Goals: To quantify SOA yield and gas-phase product yields from humid ozonolysis of d-3-carene, which will serve as a "control" experiment to subtract the ozonolysis contribution to the nighttime chemistry of d-3-carene as measured in the experiment on 6/13/22. Summary: The chamber was humidified, after which H2O2, and O3 were injected in the chamber and allowed to equilibrate. Ammonium sulfate seed particles were injected. Then d-3-carene was injected and decayed by reaction with ozone (plus some contribution from OH). Gas phase organics were monitored by CF3O- CIMS (units: normalized counts), particle formation was monitored by SMPS, and RH / T / O3 / NOx were monitored throughout. O3/NOx data sometimes require post-correction not applied here, including subtraction of an ozone interference from H2O2 (1 ppm H2O2 is detected as about 12 ppb ozone) and correction for an in-line HEPA filter (see timeline for applicable timing) that scrubs about 10% of NO2 and 45% of ozone. Organization: Nguyen Group Lab Affiliation: UC Davis Chamber: Tran's big bag of air Experiment Category: Gas phase chemical reaction, Aerosol formation Oxidant: Ozone Reactants: (+)-D-3-Carene, Ammonium Sulfate, Ozone, Hydrogen Peroxide Reaction Type: Dark oxidation Relative Humidity: 62 Temperature: 22 Seed Name: Ammonium sulfate Pressure: approx 1 atm