Titlebook: Semiempirical Methods of Electronic Structure Calculation; Part B: Applications Gerald A. Segal Book 1977 Plenum Press, New York 1977 Hamil

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o model systems of variable appositeness in most of these fields. The fundamental problem, from a basic computational point of view, is that large molecules require large numbers of basis functions, whether Slater- type orbitals or Gaussian functions suitably contracted, to provide even a modestly accurate de978-1-4684-2561-1978-1-4684-2559-8

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structure of molecules, one is immediately struck by the rather narrow limits imposed by economic and numerical feasibility. Most of the systems with which experimental photochemists actually work are beyond the grasp of ab initio methods due to the presence of a few reasonably large aromatic ring

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Approximate Methods for the Electronic Structures of Inorganic Complexes,specific to inorganic .. and .. complexes and hence no overlap with organic molecules was encountered. This is, however, no longer the case. Modern calculational and experimental methods have made it possible to probe deep into the electronic structures of all molecules and ions, thereby breaking do

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