Experiment: 2014 FIXCIT Study_20140117_4-hydroxy 3-peroxy ISOPOOH_Hydroxyl radical_No Seed_4,3-ISOPOOH + OH, low NO, dry, no seeds


Name: 2014 FIXCIT Study_20140117_4-hydroxy 3-peroxy ISOPOOH_Hydroxyl radical_No Seed_4,3-ISOPOOH + OH, low NO, dry, no seeds
Date: 2014-01-17

2014 FIXCIT Study

Seinfeld chambers

Experiment Set
FIXCIT experiments

Observe the products (first generation:beta IEPOX) of OH oxidation; evaluate the OH LIF interference from an organic peroxide; observe ISOPOOH and its oxidation products as interferences for GC-FID/PTR-MS/others.

The experiment went well. Long sampling periods were provided before and after oxidation to help instrument teams evaluate interferences from ISOPOOH and its products. A little over 2/3 of the ISOPOOH was reacted away using ~500 ppb of H2O2 as the OH source. Note that the ISOPOOH sample itself contained H2O2, so H2O2 was present in the bag before it was added explicitly.

Additional Notes
TD LIF - up; PTRMS - up; CRM OHR - up; GTHOS - up LIF OHR - up ; NO CL - up; GLY LIP - down ; FOR LIF - up ; I/A CIMS - up; NCIMS - up; RHTO3 - up; GC FID - up; AMS - up; TQC1 - up; TQC2 - up; TOFCIMS - up

Experiment Details


  • Gas phase chemical reaction
Temperature: 25
Relative Humidity: 5
Seeded Experiment: No
Fuchs Adjusted Surface Area:
Condensation sink rate coefficient: 5
Reaction type:
Oxidant Name: Hydroxyl radical
Initial Oxidant Concentration Value: 1.2e6 (molecules_per_cubic_centimeter)
RO2 Main Fate: HO2
RO2 Lifetime: (Seconds)
Pressure: 760 Torr

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

Experiment Set Details

Name: FIXCIT experiments
Time format and units: Seconds past midnight
The Focused Isoprene eXperiment at the California Institute of Technology (FIXCIT) was a collaborative study at the atmospheric chambers of Caltech during January 2014. FIXCIT is the laboratory component of SOAS, and is aimed toward (1) better understanding the chemical details behind ambient observations relevant to the southeastern United States, (2) advancing the knowledge of atmospheric oxidation mechanisms of important biogenic hydrocarbons, and (3) characterizing the behavior of field instrumentation using authentic standards. A series of chamber experiments was conducted to investigate the oxidation of isoprene, α-pinene, methacrolein, pinonaldehyde, acylperoxy nitrates, isoprene hydroxy nitrates (ISOPN), isoprene hydroxy hydroperoxides (ISOPOOH), and isoprene epoxydiols (IEPOX). Pinonaldehyde and isomer-specific standards of ISOPN, ISOPOOH, and IEPOX were synthesized, enabling study of the oxidation mechanisms and instrument responses for these compounds.


  • Allen H. Goldstein UC Berkeley
  • William H. Brune Penn State University
  • Ronald C. Cohen UC Berkeley
  • Delphine K. Farmer Colorado State University
  • Manjula R. Canagaratna Aerodyne
  • Douglas R. Worsnop Aerodyne
  • Jose L. Jimenez University of Colorado Boulder
  • Frank N. Keutsch Harvard
  • Saewung Kim UC Irvine
  • Alex B. Guenther UC Irvine
  • John E. Mak SUNY Stonybrook
  • Geoffrey S. Tyndall NCAR
  • Denise D. Montzka NCAR
  • Andrew J. Weinheimer NCAR
  • Alam Hasson Fresno State


Principal investigators:

Paul O. Wennberg
Phone: 626 395 2447
E-mail: wennberg@caltech.edu
OrcID: 0000-0002-6126-3854

John H. Seinfeld
Phone: 626-395-4635
E-mail: seinfeld@caltech.edu
OrcID: 0000-0003-1344-4068

John D. Crounse
Phone: 626-395-8655
E-mail: crounjd@caltech.edu
OrcID: 0000-0001-5443-729X

Tran B Nguyen
Phone: 5307525987
E-mail: tbn@ucdavis.edu
OrcID: 0000-0001-9206-4359

Data Manager:

Tran B. Nguyen
Phone: 5307525987
E-mail: tbn@ucdavis.edu


Reactant Compound type Concentration Concentration units
4-hydroxy 3-peroxy ISOPOOH
  • Alcohol
  • Hydroperoxide
50 Parts Per Billion

20140117_expTimeline.csv Timeline

UTC_hr Action
15:30 ISOPOOH addition started(CF3O- CIMS on bag)
17:16 ISOPOOH addition stopped
17:16 Filling bag with air
17:24 bag filled with air
17:25 all instruments sample from bag
18:48 Discovery of bag fill switch in on position; meaning additional air was added to bag up to this time.[ISOPOOH] should be stable from here to H2O2 addition.
19:35 addition of 19uL of H2O2. followed by addition of air to fill bag.
20:10 H2O2 injection stopped
20:31 lights on
22:48 lights off
26:00 temperature set to 45 C
26:30 bag sampling completed. Temperature reached ~42 C.

Light Flux Characterizations:
2013-12-16 (#17)
Particle Loss Characterizations:
2013-03-07 (#13)
Vapor Loss Characterizations:

Chamber Details

Name: Seinfeld chambers
Volume in cubic meters: 22
Shape: Rectangular Prism
Surface area in cubic meters: 48
Flow Mode: Batch
Flow through rate in liters per minute:
Body Material: Teflon
Body thickness: 2
Replacement date:
Replacement frequency: As needed
Cleaning method: Flushing with air Flushing with air with UV lights on Oxidation
o3 background: < 0.5 ppb
nox background: 40 ppt
Particle background in micrograms per cubic meter: < 0.01 ug/m3
Air filtration method: Custom filtration canisters to remove NOx, hydrocarbons, water, particles, ozone, SOx from pressurized ambient air.
Mixing method: 1
Mixing method material: Pulsed air jets, manually actuated
Temparature Control: Yes
Temparature measurements recorded: Yes
Temparature range (min degrees celcius): 10
Temparature range (max degrees celcius): 45
Humidity Control: Yes
Humidity Measurements Recorded: Yes
Relative humidity range (min percent): 4
Relative humidity range (max percent): 90
Particle experiment capability: 1
Lights: Yes
Light source type(s): UV black lamps (350 nm centered)
Supplemental information: https://www.worldscientific.com/doi/abs/10.1142/9789813147355_0001
Additional Notes: