Goals:
To quantify SOA yield and gas-phase product yields from humid ozonolysis of g-terpinene, which will serve as a "control" experiment to subtract the ozonolysis contribution to the nighttime chemistry of g-terpinene as measured in the experiment on 6/14/22.
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 g-terpinene 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: gamma-Terpinene, Ammonium Sulfate, Ozone, Hydrogen Peroxide
Reaction Type: Dark oxidation
Relative Humidity: 63
Temperature: 22
Seed Name: Ammonium sulfate
Pressure: approx 1 atm
