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Oxygen‐18 Isotope Effect in the Reaction of Oxygen with Copper

dc.contributor.authorBernstein, Richard B.en_US
dc.date.accessioned2010-05-06T21:06:26Z
dc.date.available2010-05-06T21:06:26Z
dc.date.issued1955-10en_US
dc.identifier.citationBernstein, Richard B. (1955). "Oxygen‐18 Isotope Effect in the Reaction of Oxygen with Copper." The Journal of Chemical Physics 23(10): 1797-1802. <http://hdl.handle.net/2027.42/69760>en_US
dc.identifier.urihttps://hdl.handle.net/2027.42/69760
dc.description.abstractThe fractionation of oxygen‐18 in the reaction of copper with oxygen of natural isotopic composition has been measured over the temperature range 68—256°C. The oxide films (estimated thicknesses varying from 150—2500 A) were removed for O18 assay by treatment with hydrogen at 350°C. Using the CO2 equilibration technique, the O18/O16 ratios for the resulting water samples were determined mass spectrometrically and compared with the ratio for a reference sample of water prepared from the original oxygen gas.The direction of the fractionation indicated that O216 reacts preferentially compared to O16O18. The isotope effect appeared to be independent of the oxygen pressure over the limited range studied (2—25 cm Hg). The magnitude of the fractionation factor was 2.0% at 150°C, with a small negative temperature coefficient. From this it was possible to estimate a value of ΔEact=17 cal/mole, which may be compared with the calculated isotopic zero‐point energy difference of 64 cal/mole. The theoretical implications of the experimental results are discussed.en_US
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dc.publisherThe American Institute of Physicsen_US
dc.rights© The American Institute of Physicsen_US
dc.titleOxygen‐18 Isotope Effect in the Reaction of Oxygen with Copperen_US
dc.typeArticleen_US
dc.subject.hlbsecondlevelPhysicsen_US
dc.subject.hlbtoplevelScienceen_US
dc.description.peerreviewedPeer Revieweden_US
dc.contributor.affiliationumDepartment of Chemistry, University of Michigan, Ann Arbor, Michiganen_US
dc.description.bitstreamurlhttp://deepblue.lib.umich.edu/bitstream/2027.42/69760/2/JCPSA6-23-10-1797-1.pdf
dc.identifier.doi10.1063/1.1740580en_US
dc.identifier.sourceThe Journal of Chemical Physicsen_US
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dc.owningcollnamePhysics, Department of


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