International Journal of Quantum Chemistry

Cover image for Vol. 114 Issue 24

Online ISSN: 1097-461X

Associated Title(s): Journal of Computational Chemistry

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Recently Published Articles

  1. You have free access to this content
    Density matrix renormalization group for ab initio Calculations and associated dynamic correlation methods: A review of theory and applications

    Takeshi Yanai, Yuki Kurashige, Wataru Mizukami, Jakub Chalupský, Tran Nguyen Lan and Masaaki Saitow

    Article first published online: 22 OCT 2014 | DOI: 10.1002/qua.24808

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    Active space methodologies of ab initio quantum chemistry have been combined with the recent advent of density matrix renormalization group (DMRG) method, and applied to multireference electronic systems of various molecules. DMRG-based methods are capable of handling large active spaces, consisting of 30–40 orbitals for general systems or even larger for ideal ones.

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    Chemical reaction analyses based on orbitals and orbital energies

    Takao Tsuneda

    Article first published online: 18 OCT 2014 | DOI: 10.1002/qua.24805

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    Orbital energies are better suited to quantitative chemical reaction analyses than molecular orbitals, because the formers are much more sensitive to the quality of included electron correlation than the latters. Although orbital-based reaction analysis methods such as the frontier orbital theory have been used for qualitative discussions, the situation is rapidly changing, because accurate orbital energies recently become available by long-range corrected density functional theory.

  3. Investigating the nature of intermolecular and intramolecular bonds in noble gas containing molecules

    Afshan Mohajeri and Nafiseh Bitaab

    Article first published online: 18 OCT 2014 | DOI: 10.1002/qua.24804

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    Noble gas compounds can have large dipole moments and thus be expected to form dipole or hydrogen bond complexes with small molecules. Noble gas containing systems of the general formula FNgR and NgR (Ng = He, Ne, Ar, Kr, Xe and R = CH3, CN, CCH, BO, BNH, H, BeO, AuF) are systematically investigated by first-principles. In particular theoretical calculations shine a light on the intermolecular hydrogen bonding formed between FNgR molecules and hydrogen fluoride.

  4. Bound state solutions of D-dimensional schrödinger equation with exponential-type potentials

    J. J. Peña, J. García-Martínez, J. García-Ravelo and J. Morales

    Article first published online: 10 OCT 2014 | DOI: 10.1002/qua.24803

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    The quantum-chemical structure of a molecule is summarized in its potential energy curves where the minimum determines the bond lengths, the second derivative determines the force constants that lead to vibrational and rotational levels. This perspective discusses the solution of a class of multiparameter exponential-type potential where a suitable selection of the parameters gives rise to a specific potential. The proposal provides the energy spectra and wave-functions.

  5. Reactivity dynamics of a confined molecule in presence of an external magnetic field

    Munmun Khatua, Utpal Sarkar and Pratim Kumar Chattaraj

    Article first published online: 9 OCT 2014 | DOI: 10.1002/qua.24801

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    Confined environment helps us explore novel properties of a given system, as the confined system often behaves differently compared to its free counterpart. The behavior of a confined H2 molecule (ground and excited states) in a time-dependent oscillating magnetic field is a good example of this phenomenon. Based on the time evolution of various chemical reactivity parameters, it is concluded that confinement makes the system more stable.