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Mass-dependent isotopic fractionation in ozone produced by electrolysis.
MedLine Citation:
PMID:  19462962     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
During the electrolysis of water in an acidified medium, ozone is produced, in association with oxygen, at the anode. This ozone is found to be depleted in heavy isotopes ((18)O and (17)O), with respect to the source water, following a strict mass-dependent rule. Our experiments also suggest that the isotopes are distributed at the apex and base positions of the bent ozone molecule in a random fashion, without obeying the zero-point energy constraint. Endowed with these characteristics, the electrolytic ozone provides a source of reference that has a known internal heavy isotope distribution for spectroscopic studies. In addition, this ozone, when subjected to photolytic decomposition, can be used as a source of atomic oxygen with mass-dependent isotope ratios that can be varied by simply changing the water composition. Such an oxygen source is important for studying isotope effects in gas-phase recombination/exchange reactions such as COO + O* --> [COOO*] --> COO* + O.
Authors:
S K Bhattacharya; Joel Savarino; Boaz Luz
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Analytical chemistry     Volume:  81     ISSN:  1520-6882     ISO Abbreviation:  Anal. Chem.     Publication Date:  2009 Jul 
Date Detail:
Created Date:  2009-06-30     Completed Date:  2009-09-29     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0370536     Medline TA:  Anal Chem     Country:  United States    
Other Details:
Languages:  eng     Pagination:  5226-32     Citation Subset:  -    
Affiliation:
Earth Sciences Division, Physical Research Laboratory, Ahmedabad, Gujarat 380009, India. bhatta@prl.res.in
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