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Recent Advances In Multireference Methods
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Book Synopsis Recent Advances in Multireference Methods by : K Hirao
Download or read book Recent Advances in Multireference Methods written by K Hirao and published by World Scientific. This book was released on 1999-02-04 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recently, accurate ab initio quantum computational chemistry has evolved dramatically. In particular, the development of multireference-based approaches has opened up a whole new area and has also had a profound impact on the potential of theoretical chemistry. The multiconfigurational SCF (MCSCF)/CASSCF method is an attempt to generalize the Hartree–Fock (HF) model and to treat real chemical processes, where nondynamic correlation is important, while keeping the conceptual simplicity of the HF model as much as possible. Although MCSCF/CASSCF itself does not include dynamic correlations, it provides a good starting point for such studies. There are three approaches to handling dynamic correlations. Beginning with the MSSCF/CASSCF wave function, they are the variational (MRCI), perturbational (MRPT) and cluster expansion (MRCC) approaches. This important book presents the most recent and important developments in multireference-based approaches and their applications. Its main purpose is to highlight essential aspects of the frontiers of multireference theory and provide readers with the fundamental knowledge necessary for further development. Contents:The Configuration-Driven Approach for Multireference Configuration Interaction Calculations (R J Buenker & S Krebs)Multi-Reference Perturbation Theory (E R Davidson & A A Jarzecki)Response Theories Based on a State-Specific Multireference Coupled Cluster Formalism (S Chattopadhyay et al.)Multireference Coupled Pair Approximation: A State-Universal Approach of a CEPA Type Variant of MRSDCI (K Tanaka et al.)Analytic Energy Gradients for Second-Order Multireference Perturbation Theory (H Nakano et al.)Multiconfigurational Perturbation Theory Applied to Excited States of Organic Compounds (M Merchán et al.)Weak Overlap and Spin Recouping: Applications of the CAS SCF Method (M Dupuis & A Marquez) Readership: Graduates in theoretical chemistry, atomic and molecular physics. Keywords:
Book Synopsis Recent Advances in Multireference Methods by : Kimihiko Hirao
Download or read book Recent Advances in Multireference Methods written by Kimihiko Hirao and published by World Scientific. This book was released on 1999 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recently, accurate ab initio quantum computational chemistry has evolved dramatically. In particular, the development of multireference-based approaches has opened up a whole new area and has also had a profound impact on the potential of theoretical chemistry. The multiconfigurational SCF (MCSCF)/CASSCF method is an attempt to generalize the Hartree-Fock (HF) model and to treat real chemical processes, where nondynamic correlation is important, while keeping the conceptual simplicity of the HF model as much as possible. Although MCSCF/CASSCF itself does not include dynamic correlations, it provides a good starting point for such studies. There are three approaches to handling dynamic correlations. Beginning with the MSSCF/CASSCF wave function, they are the variational (MRCI), perturbational (MRPT) and cluster expansion (MRCC) approaches. This important book presents the most recent and important developments in multireference-based approaches and their applications. Its main purpose is to highlight essential aspects of the frontiers of multireference theory and provide readers with the fundamental knowledge necessary for further development.
Book Synopsis Recent Advances in Coupled-cluster Methods by : Rodney J. Bartlett
Download or read book Recent Advances in Coupled-cluster Methods written by Rodney J. Bartlett and published by World Scientific. This book was released on 1997 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt: Today, coupled-cluster (CC) theory has emerged as the most accurate, widely applicable approach for the correlation problem in molecules. Furthermore, the correct scaling of the energy and wavefunction with size (i.e. extensivity) recommends it for studies of polymers and crystals as well as molecules. CC methods have also paid dividends for nuclei, and for certain strongly correlated systems of interest in field theory.In order for CC methods to have achieved this distinction, it has been necessary to formulate new, theoretical approaches for the treatment of a variety of essential quantities. These include properties and, particularly, analytical first derivatives (gradients) that readily provide the forces on the atoms in a molecule to facilitate searching potential energy surfaces for structures and transition states; second derivatives (Hessians) which indicate the type of extremum point and provide vibrational frequencies and intensities; excited, ionized, and electron attached states including their properties; multi-configurational reference functions to add important non-dynamic correlation; and relativistic effects.This book addresses very recent work in each of the above topics in ten chapters written by leading experts in molecular CC theory. This is NOT a collection of reviews, but is, instead, forefront research explained in an unusually clear exposition. Each chapter presents new results and formulations that offer another step toward providing the next generation of powerful CC solutions.The gap that often exists between text books and research can be more of a chasm in highly technical fields like CC theory, but this volume helps to fill the void, as it provides a sequel to a graduate level course in CC theory and many-electron methods. Essentially all current directions for new research are well represented in the authoritative articles.
Book Synopsis Quantum Chemistry and Dynamics of Excited States by : Leticia González
Download or read book Quantum Chemistry and Dynamics of Excited States written by Leticia González and published by John Wiley & Sons. This book was released on 2021-02-01 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: An introduction to the rapidly evolving methodology of electronic excited states For academic researchers, postdocs, graduate and undergraduate students, Quantum Chemistry and Dynamics of Excited States: Methods and Applications reports the most updated and accurate theoretical techniques to treat electronic excited states. From methods to deal with stationary calculations through time-dependent simulations of molecular systems, this book serves as a guide for beginners in the field and knowledge seekers alike. Taking into account the most recent theory developments and representative applications, it also covers the often-overlooked gap between theoretical and computational chemistry. An excellent reference for both researchers and students, Excited States provides essential knowledge on quantum chemistry, an in-depth overview of the latest developments, and theoretical techniques around the properties and nonadiabatic dynamics of chemical systems. Readers will learn: ● Essential theoretical techniques to describe the properties and dynamics of chemical systems ● Electronic Structure methods for stationary calculations ● Methods for electronic excited states from both a quantum chemical and time-dependent point of view ● A breakdown of the most recent developments in the past 30 years For those searching for a better understanding of excited states as they relate to chemistry, biochemistry, industrial chemistry, and beyond, Quantum Chemistry and Dynamics of Excited States provides a solid education in the necessary foundations and important theories of excited states in photochemistry and ultrafast phenomena.
Book Synopsis Recent Advances in Relativistic Molecular Theory by : Kimihiko Hirao
Download or read book Recent Advances in Relativistic Molecular Theory written by Kimihiko Hirao and published by World Scientific. This book was released on 2004 with total page 343 pages. Available in PDF, EPUB and Kindle. Book excerpt: Relativistic effects, though minor in light atoms, increase rapidly in magnitude as the atomic number increases. For heavy atom species, it becomes necessary to discard the SchrAdinger equation in favor of the Dirac equation. Construction of an effective many-body Hamiltonian that accurately accounts for both relativistic and electron correlation effects in many-electron systems is a challenge. It is only in the past 20OCo25 years that relativistic quantum chemistry has emerged as a field of research in its own right, and it seems certain that relativistic many-electron calculations of molecular properties will assume increasing importance in the years ahead as relativistic quantum chemistry finds a wider range of applications.With the increasing use of relativistic quantum chemical techniques in chemistry, there is an obvious need to provide experts' reviews of the methods and algorithms. This volume aims to disseminate aspects of relativistic many-electron theories and their exciting developments by practitioners. Together, the nine chapters provide an in-depth account of the most important topics of contemporary research in relativistic quantum chemistry, ranging from quasirelativistic effective core potential methods to relativistic coupled cluster theory."
Book Synopsis Recent Progress In Orbital-free Density Functional Theory by : Wang Yan Alexander
Download or read book Recent Progress In Orbital-free Density Functional Theory written by Wang Yan Alexander and published by World Scientific. This book was released on 2013-03-08 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a comprehensive overview of state-of-the-art computational methods based on orbital-free formulation of density functional theory completed by the most recent developments concerning the exact properties, approximations, and interpretations of the relevant quantities in density functional theory.The book is a compilation of contributions stemming from a series of workshops which had been taking place since 2002. It not only chronicles many of the latest developments but also summarises some of the more significant ones. The chapters are mainly reviews of sub-domains but also include original research.
Book Synopsis Recent Advances in Density Functional Methods by : Delano P Chong
Download or read book Recent Advances in Density Functional Methods written by Delano P Chong and published by World Scientific. This book was released on 1997-05-14 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt: Of all the different areas in computational chemistry, density functional theory (DFT) enjoys the most rapid development. Even at the level of the local density approximation (LDA), which is computationally less demanding, DFT can usually provide better answers than Hartree-Fock formalism for large systems such as clusters and solids. For atoms and molecules, the results from DFT often rival those obtained by ab initio quantum chemistry, partly because larger basis sets can be used. Such encouraging results have in turn stimulated workers to further investigate the formal theory as well as the computational methodology of DFT. This Part II expands on the methodology and applications of DFT. Some of the chapters report on the latest developments (since the publication of Part I in 1995), while others extend the applications to wider range of molecules and their environments. Together, this and other recent review volumes on DFT show that DFT provides an efficient and accurate alternative to traditional quantum chemical methods. Such demonstration should hopefully stimulate frutiful developments in formal theory, better exchange-correlation functionals, and linear scaling methodology. Contents:On the Calculation of Energies and Optimised Geometries from Exchange-Correlation Potentials (D J Tozer & N C Handy)A Grid-Free Implementation of Density Functional Theory (J E Almlöf & Y C Zheng)Continuum Dielectric Models for the Solvent and Density Functional Theory: The State-of-the-Art (G D Luca et al.)On the Calculation of Multiplets (C A Daul et al.)Structural and Dynamical Features of Hydrogen Bonds from Conventional and Hybrid Density Functional Methods (C Adamo & V Barone)Chemistry by Density Functional Theory (C W Bauschlicher, Jr. et al.)The Self-Interaction Corrected Local Density Approximation Method (M A Whitehead)Index Readership: Researchers and graduate students in computational chemistry and computational physics. keywords:
Book Synopsis Annual Reports in Computational Chemistry by : David C. Spellmeyer
Download or read book Annual Reports in Computational Chemistry written by David C. Spellmeyer and published by Elsevier. This book was released on 2005-04-12 with total page 263 pages. Available in PDF, EPUB and Kindle. Book excerpt: Annual Reports in Computational Chemistry is a new periodical providing timely and critical reviews of important topics in computational chemistry as applied to all chemical disciplines. Topics covered include quantum chemistry, molecular mechanics, force fields, chemical education, and applications in academic and industrial settings. Each volume is organized into (thematic) sections with contributions written by experts. Focusing on the most recent literature and advances in the field, each article covers a specific topic of importance to computational chemists. Annual Reports in Computational Chemistry is a 'must' for researchers and students wishing to stay up-to-date on current developments in computational chemistry. * Broad coverage of computational chemistry and up-to-date information * The topics covered include quantum chemistry, molecular mechanics, force fields, chemical education, and applications in academic and industrial settings * Each chapter reviews the most recent literature on a specific topic of interest to computational chemists
Book Synopsis Recent Advances in the Theory of Chemical and Physical Systems by : Jean-Pierre Julien
Download or read book Recent Advances in the Theory of Chemical and Physical Systems written by Jean-Pierre Julien and published by Springer Science & Business Media. This book was released on 2006-05-05 with total page 586 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in the Theory of Chemical and Physical Systems is a collection of 26 selected papers from the scientific presentations made at the 9th European Workshop on Quantum Systems in Chemistry and Physics (QSCP-IX) held at Les Houches, France, in September 2004. This volume encompasses a spectrum of developing topics in which scientists place special emphasis on theoretical methods in the study of chemical and physical properties of various systems: Quantum Chemical Methods (including CC and DFT for excited states) Relativistic and Heavy-Element Systems (including radiative and nuclear effects)Complexes and Clusters (including metal complexes and clusters) Complex Systems (including quasicrystals, nanotubes and proteins).
Book Synopsis Handbook of High-resolution Spectroscopy by : Martin Quack
Download or read book Handbook of High-resolution Spectroscopy written by Martin Quack and published by John Wiley & Sons. This book was released on 2011-09-26 with total page 2236 pages. Available in PDF, EPUB and Kindle. Book excerpt: The field of High-Resolution Spectroscopy has been considerably extended and even redefined in some areas. Combining the knowledge of spectroscopy, laser technology, chemical computation, and experiments, Handbook of High-Resolution Spectroscopy provides a comprehensive survey of the whole field as it presents itself today, with emphasis on the recent developments. This essential handbook for advanced research students, graduate students, and researchers takes a systematic approach through the range of wavelengths and includes the latest advances in experiment and theory that will help and guide future applications. The first comprehensive survey in high-resolution molecular spectroscopy for over 15 years Brings together the knowledge of spectroscopy, laser technology, chemical computation and experiments Brings the reader up-to-date with the many advances that have been made in recent times Takes the reader through the range of wavelengths, covering all possible techniques such as Microwave Spectroscopy, Infrared Spectroscopy, Raman Spectroscopy, VIS, UV and VUV Combines theoretical, computational and experimental aspects Has numerous applications in a wide range of scientific domains Edited by two leaders in this field Provides an overview of rotational, vibration, electronic and photoelectron spectroscopy Volume 1 - Introduction: Fundamentals of Molecular Spectroscopy Volume 2 - High-Resolution Molecular Spectroscopy: Methods and Results Volume 3 - Special Methods & Applications
Book Synopsis Current Topics In Atomic, Molecular And Optical Physics: Invited Lectures Of Tc-2005 by : Chandana Sinha
Download or read book Current Topics In Atomic, Molecular And Optical Physics: Invited Lectures Of Tc-2005 written by Chandana Sinha and published by World Scientific. This book was released on 2006-12-09 with total page 285 pages. Available in PDF, EPUB and Kindle. Book excerpt: The breadth, scope and volume of research in atomic, molecular and optical (AMO) physics have increased enormously in the last few years. Following the widespread use of pulsed lasers, certain newly emerging areas as well as selected mature subfields are ushering in a second renaissance.This volume focuses on current research in these crucial areas: cold atoms and Bose-Einstein condensates, quantum information and quantum computation, and new techniques for investigating collisions and structure. The topics covered include: the multireference coupled cluster method in quantum chemistry and the role of electronic correlation in nanosystems; laser cooling of atoms and theories of the Bose-Einstein condensate; and quantum computing and quantum information transfer using cold atoms and shaped ultrafast pulses. Other articles deal with recent findings in heavy ion collisions with clusters, time-of-flight spectroscopy techniques, and a specific example of a chaotic quantum system.The contributions will greatly assist in the sharing of specialized knowledge among experts and will also be useful for postgraduate students striving to obtain an overall picture of the current research status in the areas covered.
Book Synopsis Concepts of Mathematical Physics in Chemistry: A Tribute to Frank E. Harris - by :
Download or read book Concepts of Mathematical Physics in Chemistry: A Tribute to Frank E. Harris - written by and published by Academic Press. This book was released on 2016-01-14 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: Concepts of Mathematical Physics in Chemistry: A Tribute to Frank E. Harris - Part B, presents a series of articles concerning important topics in quantum chemistry, including surveys of current topics in this rapidly-developing field that has emerged at the cross section of the historically established areas of mathematics, physics, chemistry, and biology. Presents surveys of current topics in this rapidly-developing field that has emerged at the cross section of the historically established areas of mathematics, physics, chemistry, and biology Features detailed reviews written by leading international researchers
Book Synopsis Adventures in Chemical Physics by : R. Stephen Berry
Download or read book Adventures in Chemical Physics written by R. Stephen Berry and published by John Wiley & Sons. This book was released on 2005-11-28 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt: Adventures in Chemical Physics continues to report recent advances with significant, up-to-date chapters by internationally recognized researchers from a variety of prestigious academic and professional institutions such as McGill University, the University of Pennsylvania, the Lawrence Berkeley National Laboratory, Tel Aviv University, and the University of Chicago.
Book Synopsis Advances in Quantum Chemistry by : Remigio Cabrera-Trujillo
Download or read book Advances in Quantum Chemistry written by Remigio Cabrera-Trujillo and published by Academic Press. This book was released on 2004-07-15 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Quantum Chemistry presents surveys of current developments in this rapidly developing field that falls between the historically established areas of mathematics, physics, and chemistry. With invited reviews written by leading international researchers, as well as regular thematic issues, each volume presents new results and provides a single vehicle for following progress in this interdisciplinary area. The intention of this volume, as with the previous volume in this series is to present the latest developments in the field of energy deposition as it is actually viewed by many of the major researchers working in this area. It is not possible to incorporate all of the important players and all of the topics related to energy deposition in the limited space available; however the editors have tried to present the state of the art as it is now.
Book Synopsis Computational Chemistry: Reviews of Current Trends by : Jerzy Leszczynski
Download or read book Computational Chemistry: Reviews of Current Trends written by Jerzy Leszczynski and published by World Scientific. This book was released on 1999-11-05 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume presents a balanced blend of methodological and applied contributions. It supplements well the first three volumes of the series, revealing results of current research in computational chemistry. It also reviews the topographical features of several molecular scalar fields. A brief discussion of topographical concepts is followed by examples of their application to several branches of chemistry. The size of a basis set applied in a calculation determines the amount of computer resources necessary for a particular task. The details of a common strategy — the ab initio model potential method — which could be used to minimize such a task are revealed in the subsequent contribution. Such an approach is applied to atoms, molecules and solids. Two chapters are devoted to the prediction of solvent effects in biological systems. These effects are significant for interactions of nucleic acid bases and crucial for an evaluation of the free energies that govern the associations of macromolecules in aqueous solutions. A chapter on the developments and applications of the multireference Moller–Plesset method could be used as a reference in theoretical studies of systems where both the dynamical and nondynamical correlation effects should be accounted for. This technique is an efficient tool in such investigations. An explosive application of computational techniques — studies of detonation initiation and sensitivity in energetic compounds — is discussed in detail in the last chapter. The computational treatment of such unstable compounds allows the prediction of their crucial properties without being subject to their destructive forces. Contents:Topography of Atomic and Molecular Scalar Fields (S R Gadre)The Ab Initio Model Potential Method: A Common Strategy for Effective Core Potential and Embedded Cluster Calculations (L Seijo & Z Barandiaran)Continuum Models of Macromolecular Association in Aqueous Solution (M A Olson)Interactions of Nucleic Acid Bases: The Role of Solvent (M Orozco et al.)Recent Advances in Multireference Møller–Plesset Method (K Hirao et al.)Detonation Initiation and Sensitivity in Energetic Compounds: Some Computational Treatments (P Politzer & H E Alper) Readership: Graduate students and researchers in computational chemistry. Keywords:Continuum Model;Protein-Protein Association;Protein-Nucleic Acid Binding;Free Energy of Complex Formation;Molecular Recognition;Poisson-Boltzmann Equation;Dielectric Models;Solvation;Hydrophobic Effect;Protein Reorganization;ECP;AIMP;Core Potential;Embedding Potential;Model Potential;Ab Initio;Embedded Cluster;Relativistic;Impurity;Doped Crystal
Book Synopsis Chemical Physics and Quantum Chemistry by :
Download or read book Chemical Physics and Quantum Chemistry written by and published by Academic Press. This book was released on 2020-09-18 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Quantum Chemistry presents surveys of current topics in this rapidly developing field one that has emerged at the cross section of the historically established areas of mathematics, physics, chemistry, and biology. It features detailed reviews written by leading international researchers. In this volume the readers are presented with an exciting combination of themes. Presents surveys of current topics in this rapidly-developing field that has emerged at the cross section of the historically established areas of mathematics, physics, chemistry and biology Features detailed reviews written by leading international researchers Topics include: New advances in Quantum Chemical Physics; Original theory and a contemporary overview of the field of Theoretical Chemical Physics; State-of-the-Art calculations in Theoretical Chemistry
Book Synopsis Computational Photochemistry by : Massimo Olivucci
Download or read book Computational Photochemistry written by Massimo Olivucci and published by Elsevier. This book was released on 2005-10-20 with total page 369 pages. Available in PDF, EPUB and Kindle. Book excerpt: Computational Photochemistry, Volume 16 provides an overview of general strategies currently used to investigate photochemical processes. Whilst contributing to establishing a branch of computational chemistry that deals with the properties and reactivity of photoexcited molecules, the book also provides insight into the conceptual and methodological research lines in computational photochemistry. Packed with examples of applications of modelling of basic photochemical reactions and the computer-aided development of novel materials in the field of photodegradation (paints), photoprotection (sunscreens), color regulation (photochromic devices) and fluorescent probes, this book is particularly useful to anyone interested in the effect of light on molecules and materials. * Provides an overview of computational photochemistry, dealing with principles and applications* Demonstrates techniques that can be used in the computer-aided design of novel photo responsive materials* Written by experts in computational photochemistry
