ICARUS Chamber Experiment: 2014 FIXCIT Study_20140130_PINONALDEHYDE/Pinonic acid/Methyl nitrite_Hydroxyl radical_No Seed_Pinonaldehyde + OH, moderate NO, dry, no seeds

The pinonic acid is expected to react with OH about 4 times slower than pinonaldehyde, although there is a channel for the production of pinonic acid from the pinonaldehyde photooxidation as well. After initiating OH oxidation by methyl nitrite photolysis, CF3O- CIMS observed that almost all of the carbon ended up as the PAN of pinonaldehyde (which Geoff calls "PiPAN"). Perhaps due to the high formation of the PiPAN, we observed high amounts of nucleated organic aerosol (~40 ug/m^3 at the end of the experiment).

At the end of the experiment, most of the pinonaldehyde was gone, but more than half of the pinonic acid was left (perhaps because it's produced as well as lost through OH oxidation). We injected methyl nitrite twice, to replenish the OH. At the end, lights were turned off and the bag was flushed within 20 minutes.

Organization: 2014 FIXCIT Study Lab Affiliation: California Institute of Technology Chamber: Seinfeld chambers Experiment Category: Gas phase chemical reaction Oxidant: Hydroxyl radical Reactants: PINONALDEHYDE, Pinonic acid, Methyl nitrite Reaction Type: Photooxidation Relative Humidity: 5 Temperature: 26 Pressure: 750 Torr