Experiment: Nguyen Group_20211203_None_No Seed


Name: Nguyen Group_20211203_None_No Seed
Date: 2021-12-03

Nguyen Group

Tran's big bag of air

Experiment Set
Ammonium sulfate + isoprene diol

This experiment serves as a control for experiments on 11/16/21 and 11/19/21, to examine the partitioning of species from chamber walls to the gas phase while lights are on and filter collection is in progress.

The chamber was humidified to ~80% RH. Filter collection proceeded for ~5 hours and gas phase species were measured. ~1 hour of data is missing mid-experiment due to CIMS pressure issues

Experiment Details


  • Volatility and partitioning
  • Instrument/Chamber characterization
  • Blank/Control
Temperature: 20-22
Relative Humidity: 85
Seeded Experiment: No
Fuchs Adjusted Surface Area:
Condensation sink rate coefficient: 85
Reaction type:
Oxidant Name: None
Initial Oxidant Concentration Value: 0 (parts_per_million)
RO2 Main Fate: Not Sure
RO2 Lifetime: (Seconds)
Pressure: 755 Torr

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

Experiment Set Details

Name: Ammonium sulfate + isoprene diol
Time format and units: HH:MM, local time
Two experiments and three controls to examine the photochemistry of isoprene diol (1,2-dihydroxy-2-methylbut-3-ene) in ammonium sulfate aerosol.


  • Kelvin 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

211203_timeline.csv Timeline

Time_local_HHMM Action
9:05 RH/T/NOx/O3 monitors on
9:05 Chamber temp control on
9:15 CIMS on
9:25 Start humidifying
10:20 Stop humidifying; cap bag
11:20 lights on & filter collection start
16:22 lights off & filter collection stop
16:45 Flush bag; instruments off

Light Flux Characterizations:
2018-09-18 (#27)
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).