Experiment: Nguyen Group_20210120_2-methylbut-3-ene-1,2-diol/OZONE/CYCLOHEXANE_Ozone_No Seed


Name: Nguyen Group_20210120_2-methylbut-3-ene-1,2-diol/OZONE/CYCLOHEXANE_Ozone_No Seed
Date: 2021-01-20

Nguyen Group

Tran's big bag of air

Experiment Set
1,2-dihydroxy isoprene (DHI)

Product & rate determination on 2-methylbut-3-ene-1,2-diol (1,2-DHI) ozonolysis under humid (50% RH) conditions.

1,2-DHI and cyclohexane (as an OH scrubber) were injected and the bag was mixed and allowed to equilibrate. Ozone was injected over the course of 10 minutes with pulses of mixing air.

Experiment Details


  • Gas phase chemical reaction
Temperature: 22
Relative Humidity: 50
Seeded Experiment: No
Fuchs Adjusted Surface Area:
Condensation sink rate coefficient: 50
Reaction type:
Oxidant Name: Ozone
Initial Oxidant Concentration Value: 700 (parts_per_billion)
RO2 Main Fate: Not Sure
RO2 Lifetime: (Seconds)
Pressure: 755

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

Experiment Set Details

Name: 1,2-dihydroxy isoprene (DHI)
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.


  • Kelvin H Bates Harvard / UC Davis


Principal investigator:

Tran B. Nguyen
Phone: 5307525987
E-mail: tbn@ucdavis.edu
OrcID: 0000-0001-9206-4359

Data Manager:

Kelvin H. Bates
E-mail: kelvinhbates@gmail.com


Reactant Compound type Concentration Concentration units
2-methylbut-3-ene-1,2-diol (185554)
  • Alcohol
  • Alkene
  • Diol
180 Parts Per Billion
OZONE (24823) 700 Parts Per Billion
  • Alkane
50 Parts Per Million

timeline_210120.csv Timeline

Time_local_HHMM Action
8:45 Start humidifying
8:55 CIMS on
9:15 SMPS on
9:20 Stop humidifying
9:28 Injections start: 2 mL cyclohexane; 6.5 uL DHI
10:02 Injections stop; burst mixing air
11:02 Start injecting O3 - 1 slm O2 thru O3 generator with 50% light intensity; simultaneous mixing air bursts
11:12 Stop O3 injection

Light Flux Characterizations:
Particle Loss Characterizations:
Vapor Loss Characterizations:

Chamber Details

Name: Tran'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:
Replacement frequency: As needed
Cleaning method: Flushing with air Flushing with air with UV lights on Oxidation
o3 background: < 0.5 ppb
nox background:
Particle background in micrograms per cubic meter:
Air filtration method: Custom filtration canisters to remove NOx, hydrocarbons, water, particles, ozone, SOx from pressurized ambient air.
Mixing method: 1
Mixing method material: Pulsed air jets, manually actuated
Temparature Control: Yes
Temparature measurements recorded: Yes
Temparature range (min degrees celcius):
Temparature range (max degrees celcius):
Humidity Control: Yes
Humidity Measurements Recorded: Yes
Relative humidity range (min percent):
Relative humidity range (max percent):
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 each on two facing walls, with UV-reflective siding on all walls. Lights are controlled via 6 panels (3 on the right wall - top, mid, bottom - and 3 equivalent on the left wall).