Experiment: 2014 FIXCIT Study_20140116_ALPHA-PINENE/Methyl nitrite_Hydroxyl radical_No Seed_Alpha-pinene + OH "slow chemistry", dry, 40C, no seeds
Experiment
Name: 2014 FIXCIT Study_20140116_ALPHA-PINENE/Methyl nitrite_Hydroxyl radical_No Seed_Alpha-pinene + OH "slow chemistry", dry, 40C, no seeds
Date: 2014-01-16
Organization
2014 FIXCIT Study
Chamber
Seinfeld chambers
Experiment Set
FIXCIT experiments
Goals
Investigate "slow" (isomerization-favoring) OH chemistry of alpha-pinene
Summary
Timeline (UTC, hrs): 00:00,Instruments (NO; CF3O-; GTHOS; OHR; AMS; PTRMS) start sampling the bag 00:30,Instruments stopped sampling; added CH3ONO to the bag with 5 SLM zero air 00:35,Added alpha-pinene with 6 SLM zero air in 50degC water bath 01:22,Stopped alpha-pinene addition 01:30,Certain instruments started sampling (CF3O- CIMS; GTHOS; NO). GTHOS and NO off bag overnight 02:05,2 UV bulbs on (~ 1% lights) 16:05,Instruments started sampling on bag; AMS saw nucleation overnight; O3 instrument reads 10 ppbv 16:30,Lights off 17:34,Lights on (20%) 18:15,Lights on (100%) 19:37,Lights off 20:20,Add 2 min of NO flow to kill O3/HO2 22:45,Stopped sampling; start flushing
Additional Notes
Instrument Status: 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 Bag additions: CH3ONO - 500 mL bulb, 1.6 torr, T = 22degC a-Pinene - 3.8 mgExperiment Details
Categories:
- Gas phase chemical reaction
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: 6e4 (molecules_per_cubic_centimeter)
RO2 Main Fate: Autoxidation/Isomerization
RO2 Lifetime: (Seconds)
Pressure: 750 Torr
Data Sets
Data Set plots
Experiment Set Details
Name: FIXCIT experiments
Time format and units: Seconds past midnight
Description:
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.
Collaborators:
- 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
Contacts
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
20140116_expTimeline.csv
Timeline
| UTC_hr | Action |
| 00:00 | Instruments (NO; CF3O-; GTHOS; OHR; AMS; PTRMS) start sampling the bag |
| 00:30 | Instruments stopped sampling; added CH3ONO to the bag with 5 SLM zero air |
| 00:35 | Added alpha-pinene with 6 SLM zero air in 50degC water bath |
| 01:22 | Stopped alpha-pinene addition |
| 01:30 | Certain instruments started sampling (CF3O- CIMS; GTHOS; NO). GTHOS and NO off bag overnight |
| 02:05 | 2 UV bulbs on (~ 1% lights) |
| 16:05 | Instruments started sampling on bag; AMS saw nucleation overnight; O3 instrument reads 10 ppbv |
| 16:30 | Lights off |
| 17:34 | Lights on (20%) |
| 18:15 | Lights on (100%) |
| 19:37 | Lights off |
| 20:20 | Add 2 min of NO flow to kill O3/HO2 |
| 22:45 | Stopped sampling; start flushing |
Citations
Characterizations
2013-12-16 (#20)
Particle Loss Characterizations:
(None)
Vapor Loss Characterizations:
(None)
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: