Experiment: Nguyen Group_20210123_2-methylbut-3-ene-1,2-diol/Methyl nitrite_Hydroxyl radical_N/A

Experiment

Name: Nguyen Group_20210123_2-methylbut-3-ene-1,2-diol/Methyl nitrite_Hydroxyl radical_N/A
Date: 2021-01-23

Organization
Nguyen Group

Chamber
Tran's big bag of air

Experiment Set
1,2-dihydroxy isoprene (DHI)

Goals
Product study on 2-methylbut-3-ene-1,2-diol (1,2-DHI) + OH, unseeded, dry, trying to get the best conditions possible for any isomerization/autooxidation to occur (including high temperature, low OH / light)

Summary
The chamber was heated to 35˚C and all but two lights were removed from the chamber (~3% of max light flux). 1,2-DHI and CH3ONO were injected and allowed to mix and equilibrate, after which the lights were turned on and left on overnight (>24 h). The CIMS was acting up and running out of reagent gas, so signals were pretty wonky before 12:00 on the first day and after 06:00 on the second.

Experiment Details

Categories:

  • Gas phase chemical reaction
Temperature: 35
Relative Humidity: 5
Seeded Experiment: No
Fuchs Adjusted Surface Area:
Condensation sink rate coefficient: 5
Reaction type:
Oxidant Name: Hydroxyl radical
Initial Oxidant Concentration Value: 3e5 (molecules_per_cubic_centimeter)
RO2 Main Fate: Autoxidation/Isomerization
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
Description:
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.

Collaborators:

  • Kelvin H Bates Harvard / UC Davis

Contacts

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

Reactants

Reactant Compound type Concentration Concentration units
2-methylbut-3-ene-1,2-diol (185554)
  • Alcohol
  • Alkene
  • Diol
110 Parts Per Billion
Methyl nitrite (12231) 40 Parts Per Billion

timeline_210123.csv Timeline

Time_local_HHMM Action
9:33 CIMS on
9:43 Start DHI injection
10:09 Start CH3ONO injection
10:19 Stop both injections; mixing air bursts
11:20 2 lights on (~3%)
13:20 pause CIMS to reduce sampling frequency for overnight sampling
11:45 day 2 Start reducing temperature and shutting down
13:00 day 2 CIMS off; bag flushed

Characterizations
Light Flux Characterizations:
(None)
Particle Loss Characterizations:
(None)
Vapor Loss Characterizations:
(None)

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).