Electron correlation and the reality of xenon difluoride
The electronic structure of xenon difluoride has been studied using ab initio theoretical methods. The primary goal was to determine whether current theoretical methods are capable of yielding a reasonable value of the dissociation energy of XeF/sub 2/. A Slater function basis set of slightly better than ''double zeta plus polarization'' quality was employed. Four different types of wave functions were investigated: two-configuration SCF, full valence configuration interaction (CI), the first-order wave function, and a larger 1234 configuration wave function including all double excitation from the 10sigma/sub g/ orbital. Although the TCSCF symmetric stretching potential curve has both a minimum and maximum, the minimum lies above the comparable energy of separated Xe + 2F. However, the two most complete wave functions predict dissociation energies of 1.97 and 2.14 eV, in qualitative agreement with experiment, 2.78 eV. All four wave functions provide good predictions of the Xe-F equilibrium bond distance. As was the case for KrF/sub 2/, the bonding in XeF/sub 2/ is found to conform quite closely to Coulson's model F Xe/sup +/ F/sup -/ reversible F/sup -/ Xe/sup +/ F near the equilibrium geometry. The role of the ''outer orbitals'' 5d and 4f appears to be a quantitative rather than qualitative one. (auth)
- Research Organization:
- Univ. of California, Berkeley
- OSTI ID:
- 7199691
- Journal Information:
- J. Am. Chem. Soc.; (United States), Journal Name: J. Am. Chem. Soc.; (United States) Vol. 97:25; ISSN JACSA
- Country of Publication:
- United States
- Language:
- English
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