By Hernández-Laguna A., Maruani J., McWeeny R. (eds.)

Those volumes jointly contain 40 papers coming from the main remarkable contributions to the 3rd eu Quantum structures in Chemistry and Physics Workshop held in Granada, Spain (1997). those books hide a truly extensive spectrum of clinical examine paintings from quantum-mechanical many-body the right way to vital functions and computational advancements, and from atoms and molecules to condensed topic. the 1st quantity is subtitled simple difficulties and version platforms, and contains the next subject matters: density matrices and density functionals, electron correlation results, relativistic formulations, valence idea, and nuclear motions. the second one quantity is subtitled complicated difficulties and complicated structures and covers the subsequent subject matters: reaction thought, condensed topic, reactive collisions and chemical reactions, and computational chemistry and physics.

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**Sample text**

This figure shows the electron energies of the H +2 ion calculated using the Shibuya-Wulfman technique, with 15 orbitals on each center. The nearly-exact values of Koga and Matsuhashi are indicated by dots for the ground state. Excited states with m = 0 are also shown. where, as before, the index τ stands for the set of indices {a, n, l, m}, and where the coefficients Cτ,g represent the ground-state eigenvector of Kτ',τ. Similarly, the integral shown in equation (82) becomes: (90) Combining equations (81), (89) and (90), we obtain: (91) The normalization constants corresponding respectively to 3 and 15 atomic orbitals per center are shown in Tables 2 and 3.

The application of this law of neighborhood is useful for studying the transferable properties of the correlation energy contributions. The results clearly show, that the local and non-local effects can be separated. The contributions of distant (virtual) orbitals can be omitted to a rather good approximation. Two important classes of related systems are also to be mentioned. One of these series is obtained by replacing a terminal CH3 group in the normal saturated hydrocarbons by a functional group: this was an OH or an NH 2 group in our study.

I, Szeged, H–6720, Hungary c MTA, TKI, Condensed Matter Research Group at TU Budapest, Budafoki út 8, Budapest, H–1521, Hungary 1. Introduction The scope of the quantum chemistry is manifold. It provides numerical solutions obtained by the use of equations of the quantum mechanical theory. It enables to calculate bond and dissociation energies, characteristics of spectral transitions, force constants, electron and spin densities, polarizabilities. The properties referring to atoms, molecules and other systems can be theoretically determined without knowledge of empirical data of these systems (ab initio level).