Aug 23, 2023

ICARUS Chamber Experiment: 2014 FIXCIT Study_20140201_OZONE/CYCLOHEXANE_Ozone_No Seed_Characterization of GTHOS artifact with O3, HO2, and cyclohexane, 30% humidity, no seeds

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Version: 20230823-015556

Goals:
Test if the HO2 + O3 reaction contributes to the GTHOS artifact, at two RH conditions.

Summary:
Injections went smoothly. For the CF3O- CIMS, the products that were produced were mostly formic acid, H2O2, and HMHP. Ozone was constant over the course of ~ 2 h, even with lights on, and decreased immediately upon the injection of formaldehyde. Cyclohexane did not appear to react at all throughout the experiment, and the cyclohexane hydroperoxide (m/z 201 on CF3O- CIMS) was not observed. HMHP was assumed to have been produced from the HCHO + HO2 reaction, as described by Niki et al, Chem Phys Lett, 1980. There was a step-function increase of the cyclohexane signal in the GC-FID from the injection of formaldehyde. This additional signal was steady throughout the reaction, so we think there might have been some cyclohexane still left in the injection line that got injected in with the formaldehyde, and so this should not be regarded as a GC interference at the cyclohexane retention time by formaldehyde (which did not show up in the NO3 + formaldehyde experiments). The addition of water vapor decreased the HMHP signal greater than the dilution ratio, as marked by O3, indicating the HMHP signal may have a water sensitivity. Ozone did not further react away after the addition of water.

Organization: 2014 FIXCIT Study
Lab Affiliation: California Institute of Technology
Chamber: Seinfeld chambers

Experiment Category: Instrument/Chamber characterization
Oxidant: Ozone
Reactants: OZONE, CYCLOHEXANE
Reaction Type: Photooxidation
Relative Humidity: 31
Temperature: 25
Pressure: 750 Torr

DOI: https://doi.org/10.5065/q2wy-pz79

ICARUS Experiment Details: https://icarus.ucdavis.edu/experiment/411

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Temporal Range: 2014-02-01 to 2014-02-01

Related Links: Publication - Overview of the Focused Isoprene eXperiment at the California Institute of Technology (FIXCIT): mechanistic chamber studies on the oxidation of biogenic compounds

GCMD Science Keywords

GCMD Instruments

File Media Types

Support Contact

Nguyen, Tran
2014 FIXCIT Study
tbn@ucdavis.edu

Data Curator

GDEX Curator
UCAR/NCAR - GDEX
gdex@ucar.edu

Legal Constraints: Creative Commons Attribution 4.0 International License.

Access Constraints: These data are openly accessible by all registered users. Accounts are available free of charge following the registration of user information with a valid email address.

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Authors: Wennberg, Paul
Seinfeld, John
Crounse, John
Nguyen, Tran

Publisher

ICARUS Community

Suggested Citation: Wennberg, Paul, Seinfeld, John, Crounse, John, Nguyen, Tran. (2023). ICARUS Chamber Experiment: 2014 FIXCIT Study_20140201_OZONE/CYCLOHEXANE_Ozone_No Seed_Characterization of GTHOS artifact with O3, HO2, and cyclohexane, 30% humidity, no seeds. Version 20230823-015556. ICARUS Community. https://doi.org/10.5065/q2wy-pz79. Accessed 24 Jan 2025.

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