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Electron density in Si2 and Cl2
Authors:Janusz Mrozek  Vedene H Smith Jr  Dennis R Salahub  Piet Ros  Alon Rozendaal
Institution:1. Department of Chemistry , Queen's University , Kingston, Ontario, Canada , K7L 3N6;2. Département de Chimie , Université de Montréal , Montréal, Québec, Canada , H3C 3V1;3. Scheikundig Laboratorium der Vrije Universiteit, De Boelelaan , 1083, Amsterdam, The Netherlands
Abstract:Self consistent field-Xα molecular orbital calculations have been performed for Si2 and Cl2 using both the scattered-wave (SW) and LCAO discrete-variational (DV) versions of the method. For Si2 an SW calculation including f partial waves yields orbital densities in good agreement with those from methods which do not involve the muffin-tin approximation for the potential. The present results afford a further comparison relevant to the recent discussion (see, M. Schlüter et al. 9]) of the relative accuracy of various pseudocharge densities compared with real charge densities. The deformation density from the Xα-SW calculation is in good agreement with that from the DV-Xα method and also with that from the linear muffin tin orbital method (J. Harris and R. O. Jones 8]). Differences between the valence electron distribution which is usually discussed in connection with pseudopotential schemes, and the density distribution including the 2s and 2p core electrons are delineated. For Cl2, the Xα-SW deformation density shows positive lobes along lines through the atoms perpendicular to the bond axis, is negative for most of the area between the atoms and also shows negative lobes behind the atoms. This deformation map is in good qualitative agreement with the DV-Xα map and also with recent ab initio results with the exception of a small region at the centre of the bond in which the DV-Xα and ab initio results show an excess of electrons compared with the promolecule whereas the Xα-SW results show a deficiency. Comparisons with X-ray results on solid chlorine are inconclusive so that experimental electron scattering data on gas phase chlorine will be required to resolve this difference.
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