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By J. Duchesne

The Advances in Chemical Physics sequence offers the chemical physics and actual chemistry fields with a discussion board for serious, authoritative reviews of advances in each zone of the self-discipline. full of state of the art learn suggested in a cohesive demeanour now not chanced on somewhere else within the literature, each one quantity of the Advances in Chemical Physics sequence serves because the excellent complement to any complex graduate classification dedicated to the research of chemical physics.

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The analysis of this approximation, to which we will return later, constitutes the central objective of Ruedenberg’s recent study;log he concludes that “ the outright neglect of neighbor overlap is not a bona fide first approximation”. 109 The adoption of approximations (33) leads to a secular determinant much simpler than (31). +mj/3 (34) are the energies of the molecular orbitals. As we shall see, it is better to follow Ruedenberg109 in calling them “ one-electron energies” or “orbital contribution” to the total energy.

The only criterion of selection is chemical intuition. Another of its serious diffculties is that when applied to large organic molecules the calculation of the wave function is extremely laborious. ) Furthermore, its application to heteronuclear molecules is excluded by mathematical difficulties. Even if now the major part of the studies of molecular structure are carried out using the other method, it should not be forgotten that the VB theory contains a large element of truth and corresponds more closely to the intuition of classical chemists.

Thus four electrons of like spin occupying these orbitals would have as their most probable arrangement the vertices of a regular tetrahedron. It is easy to show that an infinite set of such combinations is PT. I A ] ELECTRONIC STRUCTURES 19 possible, corresponding t o different orientations of a tetrahedron in space. Trigonal hybrids, sp2, are formed by the carbon atoms of an s and two p orbitals and are directed toward the vertices of an equilateral triangle in the plane of [email protected] Digonal hybrids, sp,composed of an s and a p orbital are directed in opposite directions along the axis of symmetry of the p orbital.

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