Experiment: Kelvin's lab_20220114_2-Methylbut-3-ene-1,2-diol/Hydrogen peroxide/Ammonium sulfate_Hydroxyl radical_Ammonium sulfate_RH50


Name: Kelvin's lab_20220114_2-Methylbut-3-ene-1,2-diol/Hydrogen peroxide/Ammonium sulfate_Hydroxyl radical_Ammonium sulfate_RH50
Date: 2022-01-14

Kelvin's lab

Kelvin's big bag of air

Experiment Set
1,2-dihydroxy isoprene oxidation

Product and SOA formation study on 2-methylbut-3-ene-1,2-diol (1,2-DHI) + OH, using wet (deliquesced) ammonium sulfate seeds at 50% RH. RO2 + HO2 pathway targeted.

1,2-DHI and H2O2 were injected. AS solution was atomized, and lights were then turned on to initiate photooxidation. The CIMS died briefly (~10 minutes) at 12:20. Note that the NOx and O3 monitors sampled the room air, instead of the chamber, for 1 hour starting at 10:00am

Experiment Details


  • Gas phase chemical reaction
  • Aerosol formation
Temperature: 22
Relative Humidity: 50
Seeded Experiment: Yes
Type of Seed: Ammonium sulfate
Initial Seed Concentration Value: 250
Seed Concentration Units: micrograms_per_cubic_meter
Fuchs Adjusted Surface Area:
Condensation sink rate coefficient: 50
Reaction type:
Oxidant Name: Hydroxyl radical
Initial Oxidant Concentration Value: 3e6 (molecules_per_cubic_centimeter)
RO2 Main Fate: HO2
RO2 Lifetime: (Seconds)
Pressure: 755 Torr

Data Sets

ID Instrument File  
4129 SMPS 210114_O3NOxRHT.csv

Data Set plots
Choose a file: Choose the X-Axis:

Experiment Set Details

Name: 1,2-dihydroxy isoprene oxidation
Time format and units: HH:MM, local time
A series of experiments to investigate the gas-phase oxidation rate of 1,2-dihydroxy isoprene, its oxidation products via various RO2 pathways, and the effects of including seed (AS = ammonium sulfate) particles both on observed gas-phase products and on SOA formation



Principal investigator:

Kelvin Bates
E-mail: khbates@ucdavis.edu

Data Manager:

Kelvin Bates
E-mail: khbates@ucdavis.edu


Reactant Compound type Concentration Concentration units
2-Methylbut-3-ene-1,2-diol (185554)
  • Alcohol
  • Alkene
  • Diol
120 Parts Per Billion
Hydrogen peroxide (784) 3 Parts Per Million
Ammonium sulfate (6097028) 250 Microgram Per Cubic Meter

timeline_210114.csv Timeline

´╗┐Time_local_HHMM Action
9:00 Start humidifying
9:12 SMPS on
9:28 CIMS on
9:45 Stop humidifying; start injections (H2O2 + AS seed + DHI)
10:00 Stop seed injection
10:15 All injections stopped; burst mixing air; let it equilibrate
11:00 100% lights on
12:23 CIMS computer died; ~10 minutes of data missing
12:40 Lights off
14:42 Start DNPH filter
14:53 Stop DNPH; instruments off

Light Flux Characterizations:
Particle Loss Characterizations:
2022-08-24 (#34)
Vapor Loss Characterizations:

Chamber Details

Name: Kelvin's big bag of air
Volume in cubic meters: 10
Shape: Rectangular Prism
Surface area in cubic meters: 28
Flow Mode: Batch
Flow through rate in liters per minute:
Body Material: Teflon
Body thickness: 2
Replacement date: 2022-08-24
Replacement frequency: As needed
Cleaning method: Flushing with air Flushing with air with UV lights on Oxidation
o3 background: <0.5 ppb
nox background: <0.1 ppb
Particle background in micrograms per cubic meter:
Air filtration method: Custom filtration canisters to remove NOx, hydrocarbons, water, paricles, ozone, SOx from pressurized ambient air
Mixing method: 1
Mixing method material: Pulsed air, jets manually activated
Temparature Control: Yes
Temparature measurements recorded: Yes
Temparature range (min degrees celcius): 5
Temparature range (max degrees celcius): 45
Humidity Control: Yes
Humidity Measurements Recorded: Yes
Relative humidity range (min percent): 2
Relative humidity range (max percent): 85
Particle experiment capability: 1
Lights: Yes
Light source type(s): UV broadband black lights (centered at 350 nm)
Supplemental information:
Additional Notes: 40-Watt Osram/Sylvania 350nm black lights, 48" long, T12 fluorescent; 72 bulbs, 36 on two facing walls each, with UV-reflective siding on all walls. Lights are controlled via 6 panels (3 on the right wall, 3 on the left).