Document Detail


Experimental Evidence for the Pressure Dependence of the Reaction Rate Constant between Acetic Acid and Hydroxyl Radicals.
MedLine Citation:
PMID:  20925416     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
The reaction rate constant of acetic acid with the hydroxyl radical is measured at 93 Torr with our high-pressure flow system (HPFS) and found to display a negative temperature dependence that can be described by the Arrhenius expression, k(T) = (2.44 ± 0.22) × 10(-14) exp ((1027 ± 24)/T)) cm(3) molecule(-1) s(-1). Compared with our previously reported 7 Torr data, we find a noticeable pressure dependence. This dependence is observed to increase with decreasing temperature. This finding is consistent with a termolecular reaction mechanism. It is the first experimental evidence of the pressure dependence for this rate constant. A kinetics model is constructed, and the model results agree qualitatively with our experimental data. The extrapolated rate constant of the title reaction would be faster than previously believed at conditions of the upper troposphere/lower stratosphere, suggesting that the importance of acetic acid in its impact on HO(x) chemistry is currently underestimated.
Authors:
Yi-Wen Huang; Timothy J Dransfield; James G Anderson
Related Documents :
3838486 - Pressure effect on the rate of crystalline phase formation of l-alpha-dipalmitoylphosph...
17824766 - Protein elasticity determined by pressure tuning of the tyrosine residue of ubiquitin.
10781566 - Pressure regulation of soluble cytochromes c in a deep-sea piezophilic bacterium, shewa...
11540076 - Hydrostatic pressure mimics gravitational pressure in characean cells.
11343946 - Ultra-short-acting cardioselective beta-blockade attenuates postischemic cardiac dysfun...
2346776 - Myogenic tone of the rat testicular subcapsular artery has a role in autoregulation of ...
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The journal of physical chemistry. A     Volume:  114     ISSN:  1520-5215     ISO Abbreviation:  J Phys Chem A     Publication Date:  2010 Nov 
Date Detail:
Created Date:  2010-10-29     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9890903     Medline TA:  J Phys Chem A     Country:  United States    
Other Details:
Languages:  eng     Pagination:  11538-44     Citation Subset:  IM    
Affiliation:
Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge Massachusetts 02139, United States, and Department of Chemistry, University of Massachusetts-Boston, 100 Morrissey Boulevard, Boston Massachusetts 02125, United States.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  A beneficial kinetic effect of an ?(5)-C5Me4H ligand.
Next Document:  Insights into the mechanism of O? formation and release from the Mn?O?L? "cubane" cluster.