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Author(s):   Atkinson, R.; Tuazon, E.C.; Aschmann, S.M.
Title:   Atmospheric Chemistry of 2-Pentanone and 2-Heptanone
Journal:   Environ. Sci. Technol.
Volume:   34
Page(s):   623 - 631
Year:   2000
Reference type:   Journal article
Squib:   2000ATK/TUA623-631

Reaction:   n-C5H11COCH3 + ·OH → Products
Reaction order:   2
Reference reaction:   Cyclohexane + ·OH → Products
Reference reaction order:   2
Temperature:   298 K
Pressure:  0.99 bar
Rate expression:   1.62±1.4x10-1
Bath gas:   Air
Category:  Experiment
Data type:   Relative rate value measured
Pressure dependence:   None reported
Experimental procedure:   Static or low flow - Data taken vs time
Excitation technique:   Direct photolysis
Time resolution:   In real time
Analytical technique:   Fourier transform (FTIR)
Comments:   Experiments were carried out in three different setups:
- a 5870 L evacuable Teflon coated chamber with FTIR;
- a 7900 L Teflon chamber with GC-FID and GC-MS
- a 7500 L Teflon chamber with the atmosphere pressure ionization MS (API-MS)

OH was generated by the photolysis of CH3ONO or C2H5ONO at wavelengths above 300 nm in the presence of NO.

The reference reaction was OH + cyclohexene with the accepted k = 7.21E-12 cm3molecule-1s-1.

The resulting rate constant is given with the indicated errors which are two standard deviations.

Reaction products and branching ratios are reported:

formaldehyde: 0.38 ?0.08
organic nitrates: 0.18 ?0.05
acetaldehyde: 0.15 ?0.03
propanal: 0.10 ?0.02
butanal: 0.07 ?0.01
pentanal: 0.09 ?0.01

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