Experiment: Browne Lab_20210330_Decamethylcyclopentasiloxane/Nitrous acid/Acetonitrile_Hydroxyl radical_No Seed


Name: Browne Lab_20210330_Decamethylcyclopentasiloxane/Nitrous acid/Acetonitrile_Hydroxyl radical_No Seed
Date: 2021-03-30

Browne Lab

Browne Lab Main Chamber

Experiment Set
D5 Experiments

Oxidation of D5 using HONO as the precursor to have the main RO2 fate be reaction with NO.

The siloxanol was the main product detected.

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 mbar

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

Experiment Set Details

Name: D5 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 D5 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
Decamethylcyclopentasiloxane (10913) 80 Parts Per Billion
Nitrous acid (24529)
  • Inorganic acid
  • Siloxane
400 Parts Per Billion
Acetonitrile (6342)
  • Nitrile
  • Siloxane
1 Parts Per Million

D3HONO_20210209_Logs.csv Timeline

Acquisition started (ID# 0) 3695738618
chamber background 3695738625
about to add NaNO2 3695738810
heated NOx inlet at 202C 3695740791
310C 3695741224
380C 3695741760
End of acquisition 3695742226
Acquisition started (ID# 1) 3695742226
inlety at 4C 3695742341
about to add 20ul D3 3695742939
204C 3695743433
was at 55C 3695743437
306C 3695743819
388C 3695744336
cooling inlet. 3695744982
370nm lights on 3695745712
End of acquisition 3695745835
Acquisition started (ID# 2) 3695745835
End of acquisition 3695749443
Acquisition started (ID# 3) 3695749443
NOX inlet at 204C 3695752077
303C 3695752448
reached 285. Now set to 410C 3695752739
lights off 3695753021
at 360C now 3695753025
End of acquisition 3695753051
Acquisition started (ID# 4) 3695753052
heated inlet off 3695753225
Acquisition aborted after 162 complete writes. 1 additional bufs in the incomplete last write. 3695754673

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: