Experiment: Browne Lab_20210323_Decamethylcyclopentasiloxane/Hydrogen peroxide/Acetonitrile_Hydroxyl radical_No Seed


Name: Browne Lab_20210323_Decamethylcyclopentasiloxane/Hydrogen peroxide/Acetonitrile_Hydroxyl radical_No Seed
Date: 2021-03-23

Browne Lab

Browne Lab Main Chamber

Experiment Set
D5 Experiments

Oxidation of D5 using H2O2 as the oxidant precursor to have the main reaction of RO2 to be 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 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
Hydrogen peroxide (784)
  • Hydroperoxide
1 Parts Per Million
Acetonitrile (6342)
  • Nitrile
1 Parts Per Million

D5H2O2_20210323_Logs.csv Timeline

Acquisition started (ID# 0) 3699359869
chamber background. 3699359877
overflowing inlet w3/ clean air 3699359916
back to sampling chamber 3699360152
going to add 20ul H2O2 3699360178
adding 1ul D5 3699360544
adding 20ul ACN 3699360633
900dr 700wet dilution
letting everything mix 3699360907
dilution into CIMS off 3699361326
dilution into chamber off* CIMS is sampling the same thing 3699361333
254nm lights on 3699362004
End of acquisition 3699363476
Acquisition started (ID# 1) 3699363476
End of acquisition 3699367083
Acquisition started (ID# 2) 3699367083
lights off 3699370178
End of acquisition 3699370691
Acquisition started (ID# 3) 3699370691
Acquisition aborted after 135 complete writes. 9 additional bufs in the incomplete last write. 3699372054

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: