Armentrout, P. B. and Halle, L. F. and Beauchamp, J. L. (1982) Reaction of Cr + , Mn + , Fe + , Co + , and Ni + with O2 and N2O. Examination of the translational energy dependence of the cross sections of endothermic reactions. Journal of Chemical Physics, 76 (5). pp. 2449-2457. ISSN 0021-9606 http://resolver.caltech.edu/CaltechAUTHORS:ARMjcp82
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Reactions of Cr + , Mn + , Fe + , Co + , and Ni + with O2 and N2O to yield metal oxide ions are examined using an ion beam apparatus. Reaction cross sections sigma as a function of ion translational energy E are reported. With one exception, Fe + +N2O, the cross sections exhibit an energy threshold Eo. Several models are used to interpret the excitation functions for the O2 reactions and it is concluded that the classical line-of-centers form sigma alpha (1–Eo/E) is most useful. Bond energies derived in this manner are D°(CrO + ) = 3.45±0.1 eV, D°(MnO + ) = 2.48±0.1 eV, D°(FeO + ) = 3.01±0.1 eV, D°(CoO + ) = 2.76±0.1 eV, and D°(NiO + ) = 1.95±0.1 eV. Since these bond energies are all greater than D°(N2–O) = 1.7 eV, the observation of energy thresholds for the reactions with N2O are surprising. These results are explained in terms of a qualitative view of the electronic potential energy surfaces involved.
|Additional Information:||Copyright © 1982 American Institute of Physics Received 24 September 1981; accepted 13 November 1981 The authors would like to thank J. A. Rutherford for providing his data in tabular form. One of us (PBA) would like to thank R. A. Gottscho and J. C. Tully for helpful conversations.|
|Subject Keywords:||ION BEAMS; CHEMICAL REACTIONS; CROSS SECTIONS; CHROMIUM IONS; MANGANESE IONS; IRON IONS; COBALT IONS; NICKLE IONS; OXYGEN; NITROUS OXIDE; ENERGY DEPENDENCE|
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|Deposited On:||03 May 2006|
|Last Modified:||26 Dec 2012 08:51|
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