Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 20, Issue 16, Pages 11481-11482Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7cp08360b
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In two recent papers Bandyopadhyay and co-workers studied how atmospheric trace gases catalyze the isomerization of methoxy radical (CH3O center dot) to hydroxymethyl radical ((CH2OH)-C-center dot). Their second paper extensively discussed the altitude dependence of this catalyzed isomerization. Unfortunately, they did not compare their computed isomerization rates with the abundant kinetic data on the long-established fate of CH3O center dot : reaction with O-2. This Comment shows that the fastest rate they compute for catalyzed isomerization is over one million times slower than the O-2 reaction at all altitudes considered in those papers. Furthermore, we argue that, even if the reaction CH3O center dot -> CH2OH were to occur, it would not have any atmospheric consequence. This is because the near-exclusive atmospheric fate of both center dot CH2OH and CH3O center dot is reaction with O-2 to produce CH2=O + HOO.
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