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Ab Initio Calculations on the H_(2)+D_(2)=2HD Four‐Center Exchange Reaction. I. Elements of the Reaction Surface

Wilson, C. Woodrow, Jr. and Goddard, William A., III (1969) Ab Initio Calculations on the H_(2)+D_(2)=2HD Four‐Center Exchange Reaction. I. Elements of the Reaction Surface. Journal of Chemical Physics, 51 (2). pp. 716-731. ISSN 0021-9606. doi:10.1063/1.1672061.

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We present the results of ab initio calculations on some interesting regions of the reaction surface for the four‐center exchange reaction H_(2)+D_(2)=2HD. These calculations, which use a minimum basis set of Slater orbitals, indicate that for all geometries appropriate to the transition state of the reaction, a barrier height of at least 148 kcal/mole is present. This is far greater than the energy required to produce free radicals and more than three times the experimental energy of activation, 42 kcal/mole. Considering the sources and magnitudes for errors due to correlation and basis set restrictions, we estimate the barrier height for this exchange reaction to be 132 ± 20 kcal/mole exclusive of zero‐point energies. In this paper we discuss the surface as determined by configuration interaction techniques. We find that the most favorable geometries for the exchange reactions are the square, rhombus, and kite configurations. However, all of these states are unstable with respect to H_(2) + 2H. In addition we find no evidence of collision complexes for any of the likely transition state geometries. In the following paper we will examine the G1 wavefunctions for this system in order to obtain an understanding of the factors responsible for the shape of the surface.

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Goddard, William A., III0000-0003-0097-5716
Additional Information:© 1969 American Institute of Physics. Received 27 September 1968. We wish to thank Dr. R. M. Pitzer and Dr. W. E. Palke for the use of their integral programs and D. G. Truhlar for helpful discussions and useful criticisms on the manuscript. Work partially supported by a Grant (GP-6965) from the National Science Foundation. Alfred P. Sloan Research Fellow.
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Alfred P. Sloan FoundationUNSPECIFIED
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Arthur Amos Noyes Laboratory of Chemical Physics Contribution3669
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Official Citation:Ab Initio Calculations on the H[sub 2] + D[sub 2] = 2HD Four-Center Exchange Reaction. I. Elements of the Reaction Surface C. Woodrow Wilson, Jr. and William A. Goddard III, J. Chem. Phys. 51, 716 (1969), DOI:10.1063/1.1672061
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ID Code:33263
Deposited On:16 Aug 2012 18:29
Last Modified:09 Nov 2021 21:33

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