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computational chemistry
computational chemistry

... applications useful. Beginners are advised to ®rst become familiar with the use of computational chemistry software before delving into the advanced topics section. It may even be best to come back to this book when problems arise during computations. Some of the information in the advanced topics s ...
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Dynamics of the two-spin spin-boson model with a

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... The formation of new molecular bonds and the cleavage of existing ones are among the most elementary steps that any chemical reaction, however complex the underlying mechanism may be, is comprised of [1]. In a very simplistic view, the processes of “making” and “breaking” of molecular bonds can be c ...
L-edge X-ray absorption study of mononuclear vanadium complexes
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... ligand-field and covalency effects, one must consider the spin– orbit coupling (SOC) interaction between the potentially many final state multiplets. The SOC interaction dominates the spectral appearance and is responsible for the splitting into distinct L3 and L2 edges. Therefore, L-edge spectra can ...
Quantum Field Theory in Condensed Matter Physics 2nd Ed.
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Theories of Experimentally Observed Excitation
Theories of Experimentally Observed Excitation

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... continuous spectrum of H0 is unchanged [112], and at most some eigenvalues are added in the spectral gaps (as mentioned above, this is an interesting problem in itself). For example, if the potential V1 is such that the pair of Hamiltonians (H0 , H) has a conjugate operator A in the sense of Mourre ...
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Density Functional Study of Molecular Orbitals of Ferrocene and
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... bonding will help to resolve the controversy raised by other workers [16-23] (Figure 1). ...
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Coupled cluster

Coupled cluster (CC) is a numerical technique used for describing many-body systems. Its most common use is as one of several post-Hartree–Fock ab initio quantum chemistry methods in the field of computational chemistry. It essentially takes the basic Hartree–Fock molecular orbital method and constructs multi-electron wavefunctions using the exponential cluster operator to account for electron correlation. Some of the most accurate calculations for small to medium-sized molecules use this method.The method was initially developed by Fritz Coester and Hermann Kümmel in the 1950s for studying nuclear physics phenomena, but became more frequently used when in 1966 Jiři Čížek (and later together with Josef Paldus) reformulated the method for electron correlation in atoms and molecules. It is now one of the most prevalent methods in quantum chemistry that includes electronic correlation.CC theory is simply the perturbative variant of the Many Electron Theory (MET) of Oktay Sinanoğlu, which is the exact (and variational) solution of the many electron problem, so it was also called ""Coupled Pair MET (CPMET)"". J. Čížek used the correlation function of MET and used Goldstone type perturbation theory to get the energy expression while original MET was completely variational. Čížek first developed the Linear-CPMET and then generalized it to full CPMET in the same paper in 1966. He then also performed an application of it on benzene molecule with O. Sinanoğlu in the same year. Because MET is somewhat difficult to perform computationally, CC is simpler and thus, in today's computational chemistry, CC is the best variant of MET and gives highly accurate results in comparison to experiments.
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