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Author(s):   Turpin, E.; Fittschen, C.; Tomas, A.; Devolder, P.
Title:   Reaction of OH radicals with acetone: Determination of the branching ratio for the abstraction pathway at 298 K and 1 Torr
Journal:   J. Atmos. Chem.
Volume:   46
Page(s):   1 - 13
Year:   2003
Reference type:   Journal article
Squib:   2003TUR/FIT1-13

Reaction:   (CH3)2CO + ·OHCH3C(O)CH2(·) + H2O
Reaction order:   2
Reference reaction:   (CH3)2CO + ·OH → Products
Reference reaction order:   2
Temperature:   298 K
Pressure:  1.33E-3 bar
Rate expression:   9.0x10-1±1.0x10-1
Bath gas:   He
Category:  Experiment
Data type:   Relative rate value measured
Pressure dependence:   None reported
Experimental procedure:   Flow tube - Data taken vs distance
Excitation technique:   Discharge
Time resolution:   In real time
Analytical technique:   Laser induced fluorescence
Comments:   The authors generated F, Cl, and OH atoms using a discharge flow technique and fed the radicals into a He/acetone mixture to study the reactions. F atoms were generated from a CF4 discharge, while Cl and OH generated by subsequent titrration reactions of F with water or Cl2. They monitored the formation of CH3C(O)CH2 by LIF in real time in each system and used these data to determine the relative rates of H abstraction from acetone.

The two reactions of OH with acetone were assumed to be abstraction and addition/elimination:

OH + CH3C(O)CH3 -> CH3C(O)CH2 + H2O
OH + CH3C(O)CH3 -> [CH3C(O)(OH)CH3]* -> CH3 + CH3C(O)OH

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