Experiment: NCAR_20170817_nitric oxide/hydrogen peroxide/ISOPRENE_Hydroxyl radical_No Seed_CSTR_ISOP_170817


Name: NCAR_20170817_nitric oxide/hydrogen peroxide/ISOPRENE_Hydroxyl radical_No Seed_CSTR_ISOP_170817
Date: 2017-08-17


NCAR 3rd Floor Teflon

Experiment Set
'Intermediate-NO' regime experiments

Measure the yields of methacrolein and MVK at intermediate NO levels

First, a given amount of H2O2, NO and isoprene is continuously injected into the chamber till the steady state is established. Second, the UV lights are on to initiate photochemistry till another steady state is established.

Experiment Details


  • Gas phase chemical reaction
Temperature: 35
Relative Humidity: 10
Seeded Experiment: No
Fuchs Adjusted Surface Area:
Condensation sink rate coefficient: 10
Reaction type:
Oxidant Name: Hydroxyl radical
Initial Oxidant Concentration Value: 0 (molecules_per_cubic_centimeter)
RO2 Main Fate: Autoxidation/Isomerization
RO2 Lifetime: (Seconds)
Pressure: 0.8 atm

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

Experiment Set Details

Name: 'Intermediate-NO' regime experiments
Time format and units:
We performed a series of experiments running at continuous flow steady state mode, focusing on establishing an ‘intermediate NO’ regime characterized by a constant steady-state NO level ranging from tens of ppt to a few ppb in the chamber



Principal investigator:

John Orlando
Phone: 303 497 1486
E-mail: orlando@ucar.edu

Data Manager:

Geoff Tyndall
Phone: 303 497 1472
E-mail: tyndall@ucar.edu


Reactant Compound type Concentration Concentration units
nitric oxide (145068)
  • NOx
Parts Per Billion
hydrogen peroxide (784)
  • Hydroperoxide
Parts Per Billion
  • Alkene
Parts Per Billion

Timeline_CSTR_ISOP_170817.csv Timeline

Time_UTC Event Description
17:30 started DOS injection , 30 minute injection = 150 ug/m3
18:18 injected VOC (50 ul C6, 40 ul C8, 25 uL C9, 18 uL C10) (fan on 1 min)
18:24 injected 26 Torr (2 L bulb) NO, Fan on 1 min
18:30 Injected 27 Torr MeNO2 ,Fan on 1 min
18:34 started UV cycle
20:06 started flush cycle to clean bag (experiment end)

Light Flux Characterizations:
2016-02-18 (#23)
Particle Loss Characterizations:
Vapor Loss Characterizations:

Chamber Details

Name: NCAR 3rd Floor Teflon
Volume in cubic meters: 10
Shape: Rectangular Prism
Surface area in cubic meters: 27.85
Flow Mode: CSTR
Flow through rate in liters per minute: 40
Body Material: Teflon
Body thickness: 5
Replacement date: 2017-01-17
Replacement frequency: As needed
Cleaning method: Flushing with air Flushing with air with UV lights on
o3 background: 0
nox background: 0.025
Particle background in micrograms per cubic meter: 0.1
Air filtration method: Model 737, Aadco Instruments, OH
Mixing method: 0
Mixing method material:
Temparature Control: No
Temparature measurements recorded: Yes
Temparature range (min degrees celcius): 22
Temparature range (max degrees celcius): 35
Humidity Control: Yes
Humidity Measurements Recorded: Yes
Relative humidity range (min percent): 3
Relative humidity range (max percent): 85
Particle experiment capability: 1
Lights: Yes
Light source type(s): UVA Black Lamps
Supplemental information:
Additional Notes: