Title:

ICARUS Chamber Experiment: Nguyen Group_20220520_Nitrogen Dioxide/Ammonium Sulfate/Ozone/Hydrogen Peroxide/alpha-Pinene_Nitrate radical_Ammonium sulfate


Description:

Goals:
To quantify SOA yield and gas-phase product yields (particularly of C10 nitrooxy-hydroperoxide and other organonitrates) from humid nighttime RO2+HO2-dominated NO3-initiated chemistry of a-pinene.

Summary:
The chamber was humidified, after which H2O2, NO2, and O3 were injected in the chamber and allowed to equilibrate, forming NO3 and HO2. Ammonium sulfate seed particles were injected. Then a-pinene was injected and decayed by simultaneous reaction with ozone and NO3. 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.

CIMS was periodically stopped during this experiment to retune.

Organization: Nguyen Group
Lab Affiliation: UC Davis
Chamber: Tran's big bag of air

Experiment Category: Gas phase chemical reaction, Aerosol formation
Oxidant: Nitrate radical
Reactants: Nitrogen Dioxide, Ammonium Sulfate, Ozone, Hydrogen Peroxide, alpha-Pinene
Reaction Type: Dark oxidation
Relative Humidity: 66
Temperature: 22
Seed Name: Ammonium sulfate
Pressure: approx 1 atm


Metadata URL:

https://gdex.ucar.edu/dataset/id/e6fd355f-104d-474e-bd35-5f104db74e9e.html