Experiment: Browne Lab_20210406_Octamethylcyclotetrasiloxane/Hydrogen peroxide/Acetonitrile_Hydroxyl radical_No Seed


Name: Browne Lab_20210406_Octamethylcyclotetrasiloxane/Hydrogen peroxide/Acetonitrile_Hydroxyl radical_No Seed
Date: 2021-04-06

Browne Lab

Browne Lab Main Chamber

Experiment Set
D4 Experiments

We oxidized D4 using H2O2 as the oxidant precursor to promote RO2 radical reactions with HO2.

The siloxanol was the main product formed.

Experiment Details


  • Gas phase chemical reaction
Temperature: 25
Relative Humidity: 0-5
Seeded Experiment: No
Fuchs Adjusted Surface Area:
Condensation sink rate coefficient: 0-5
Reaction type:
Oxidant Name: Hydroxyl radical
Initial Oxidant Concentration Value: 8e7 (molecules_per_cubic_centimeter)
RO2 Main Fate: HO2
RO2 Lifetime: 4 (Seconds)
Pressure: 860

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

Experiment Set Details

Name: D4 Experiments
Time format and units: CIMS time is in number of seconds since Jan 1st, 1904 in UTC. NOx data is in M/D/Y Hr:Min:Sec format in local time.
CIMS and NOx data (if available) for measurements of D4 oxidation with conditions favoring different peroxy radical fates. Three radical precursors were used, HONO, H2O2, and Cl2.


  • Mitchell Alton University of Colorado at Boulder
  • Eleanor Browne University of Colorado at Boulder


Principal investigator:

Eleanor Browne
Phone: 303-735-7685
E-mail: eleanor.browne@colorado.edu
OrcID: 0000-0002-8076-9455

Data Manager:

Mitchell Alton
E-mail: mitchell.alton@colorado.edu


Reactant Compound type Concentration Concentration units
Octamethylcyclotetrasiloxane (11169) 80 Parts Per Billion
Hydrogen peroxide (784)
  • Hydroperoxide
1 Parts Per Million
Acetonitrile (6342)
  • Nitrile
1 Parts Per Million

D4H2O2_20210406_Logs.csv Timeline

Acquisition started (ID# 0) 3700572991
chamber background 3700572997
added 20uL ACN 3700573160
added 20uL 30% H2O2 3700573258
about to add 1.4uL D4 3700573454
no flow into chamber 3700574305
254nm lights on 3700575042
End of acquisition 3700576598
Acquisition started (ID# 1) 3700576598
End of acquisition 3700580206
Acquisition started (ID# 2) 3700580206
lights off 3700583300
End of acquisition 3700583813
Acquisition started (ID# 3) 3700583813
heating inlet to 400C before NOx box. 3700585474
Acquisition aborted after 174 complete writes. 9 additional bufs in the incomplete last write. 3700585567

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

Chamber Details

Name: Browne Lab Main Chamber
Volume in cubic meters: 1
Surface area in cubic meters: 8
Flow Mode: Batch
Flow through rate in liters per minute:
Body Material: Teflon
Body thickness: 2
Replacement date: 2017-10-01
Replacement frequency: As needed
Cleaning method: Flushing with air Flushing with air with UV lights on Oxidation
o3 background:
nox background:
Particle background in micrograms per cubic meter:
Air filtration method: Uses Aadco clean air
Mixing method: 0
Mixing method material:
Temparature Control: No
Temparature measurements recorded: No
Temparature range (min degrees celcius):
Temparature range (max degrees celcius):
Humidity Control: Yes
Humidity Measurements Recorded: Yes
Relative humidity range (min percent): 0
Relative humidity range (max percent): 80
Particle experiment capability: 1
Lights: Yes
Light source type(s): Up to 10 fluorescent bulbs centered at 370nm, Up to 4 fluorescent bulbs centered at 254nm
Supplemental information:
Additional Notes: