Experiment: Browne Lab_20210331_Octamethylcyclotetrasiloxane/Nitrous acid/Acetonitrile_Hydroxyl radical_No Seed


Name: Browne Lab_20210331_Octamethylcyclotetrasiloxane/Nitrous acid/Acetonitrile_Hydroxyl radical_No Seed
Date: 2021-03-31

Browne Lab

Browne Lab Main Chamber

Experiment Set
D4 Experiments

We oxidized D4 using HONO as the oxidant precursor to promote RO2 radical reactions with NO.

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: 5e7 (molecules_per_cubic_centimeter)
RO2 Main Fate: NO
RO2 Lifetime: 0.02 (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
Nitrous acid (24529)
  • Inorganic acid
400 Parts Per Billion
Acetonitrile (6342)
  • Nitrile
1 Parts Per Million

D4HONO_20210331_Logs.csv Timeline

Acquisition started (ID# 0) 3700051029
chamber background 3700051033
going to add D4 3700051643
about to add 50uL 2M NaNO2 to 1M HNO3 3700052242
650sccm dry dilution 700sccm wet
NOx inlet at 200C 3700052716
no flow into chamber 3700052732
set to 300C 3700052980
400C 3700053226
heated inlet off 3700053464
8 370nm bulbs on 3700053575
End of acquisition 3700054636
Acquisition started (ID# 1) 3700054637
End of acquisition 3700058244
Acquisition started (ID# 2) 3700058244
heated inlet at 200C 3700059045
300C 3700059671
400C 3700060485
cooling down 3700061732
lights off 3700061788
End of acquisition 3700061851
Acquisition started (ID# 3) 3700061851
Acquisition aborted after 214 complete writes. 9 additional bufs in the incomplete last write. 3700064005

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: