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Non-adiabatic Molecular Dynamics by Accelerated Semiclassical Monte Carlo

Non-adiabatic Molecular Dynamics by Accelerated Semiclassical Monte Carlo
Author:
Publisher:
Total Pages:
Release: 2015
Genre:
ISBN:

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Non-adiabatic dynamics, where systems non-radiatively transition between electronic states, plays a crucial role in many photo-physical processes, such as fluorescence, phosphorescence, and photoisomerization. Methods for the simulation of non-adiabatic dynamics are typically either numerically impractical, highly complex, or based on approximations which can result in failure for even simple systems. Recently, the Semiclassical Monte Carlo (SCMC) approach was developed in an attempt to combine the accuracy of rigorous semiclassical methods with the efficiency and simplicity of widely used surface hopping methods. However, while SCMC was found to be more efficient than other semiclassical methods, it is not yet as efficient as is needed to be used for large molecular systems. Here, we have developed two new methods: the accelerated-SCMC and the accelerated-SCMC with re-Gaussianization, which reduce the cost of the SCMC algorithm up to two orders of magnitude for certain systems. In many cases shown here, the new procedures are nearly as efficient as the commonly used surface hopping schemes, with little to no loss of accuracy. This implies that these modified SCMC algorithms will be of practical numerical solutions for simulating non-adiabatic dynamics in realistic molecular systems.


Molecular Dynamics Simulation

Molecular Dynamics Simulation
Author: Giovanni Ciccotti
Publisher: MDPI
Total Pages: 627
Release: 2018-10-08
Genre: Electronic book
ISBN: 3906980650

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Printed Edition of the Special Issue Published in Entropy


Semiclassical Nonadiabatic Molecular Dynamics

Semiclassical Nonadiabatic Molecular Dynamics
Author: Chaoyuan Zhu
Publisher: Springer
Total Pages: 0
Release: 2024-09-11
Genre: Science
ISBN: 9789819742950

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This book shows how to derive the simple and accurate semiclassical methods analytically and its applications to excited-state molecular dynamics and spectroscopy simulation with and without classical trajectories. It consists of eight chapters demonstrating interesting conical and intersystem-driven photochemical processes in complex systems targeting on large-scale ab initio direct nonadiabatic molecular dynamics. It also includes two chapters dealing with time-independent and time-dependent nonadiabatic molecular dynamics and clarifies the underline principle of Born–Oppenheimer approximation associated with coherence/decoherence quantum effects that have a wide range of applications in photochemistry and photophysics. This book is interesting and useful to a wide readership in the various fields of basic quantum chemistry and physics associated with large-scale excited-state simulation of nonadiabatic molecular dynamics and spectroscopy.


Quantum Chemistry and Dynamics of Excited States

Quantum Chemistry and Dynamics of Excited States
Author: Leticia González
Publisher: John Wiley & Sons
Total Pages: 52
Release: 2021-02-01
Genre: Science
ISBN: 1119417759

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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.


Molecular Quantum Dynamics

Molecular Quantum Dynamics
Author: Fabien Gatti
Publisher: Springer Science & Business Media
Total Pages: 281
Release: 2014-04-09
Genre: Science
ISBN: 3642452906

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This book focuses on current applications of molecular quantum dynamics. Examples from all main subjects in the field, presented by the internationally renowned experts, illustrate the importance of the domain. Recent success in helping to understand experimental observations in fields like heterogeneous catalysis, photochemistry, reactive scattering, optical spectroscopy, or femto- and attosecond chemistry and spectroscopy underline that nuclear quantum mechanical effects affect many areas of chemical and physical research. In contrast to standard quantum chemistry calculations, where the nuclei are treated classically, molecular quantum dynamics can cover quantum mechanical effects in their motion. Many examples, ranging from fundamental to applied problems, are known today that are impacted by nuclear quantum mechanical effects, including phenomena like tunneling, zero point energy effects, or non-adiabatic transitions. Being important to correctly understand many observations in chemical, organic and biological systems, or for the understanding of molecular spectroscopy, the range of applications covered in this book comprises broad areas of science: from astrophysics and the physics and chemistry of the atmosphere, over elementary processes in chemistry, to biological processes (such as the first steps of photosynthesis or vision). Nevertheless, many researchers refrain from entering this domain. The book "Molecular Quantum Dynamics" offers them an accessible introduction. Although the calculation of large systems still presents a challenge - despite the considerable power of modern computers - new strategies have been developed to extend the studies to systems of increasing size. Such strategies are presented after a brief overview of the historical background. Strong emphasis is put on an educational presentation of the fundamental concepts, so that the reader can inform himself about the most important concepts, like eigenstates, wave packets, quantum mechanical resonances, entanglement, etc. The chosen examples highlight that high-level experiments and theory need to work closely together. This book thus is a must-read both for researchers working experimentally or theoretically in the concerned fields, and generally for anyone interested in the exciting world of molecular quantum dynamics.


Modern Methods for Multidimensional Dynamics Computations in Chemistry

Modern Methods for Multidimensional Dynamics Computations in Chemistry
Author: Donald Leo Thompson
Publisher: World Scientific
Total Pages: 764
Release: 1998
Genre: Science
ISBN: 9789810233426

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This volume describes many of the key practical theoretical techniques that have been developed to treat chemical dynamics problems in many-atom systems. It contains thorough treatments of fundamental theory and prescriptions for performing computations. The selection of methods, ranging from gas phase bimolecular reactions to complex processes in condensed phases, reflects the breadth of the field.The book is an excellent reference for proven and accepted methods as well as for theoretical approaches that are still being developed. It is appropriate for graduate students and other ?novices? who wish to begin working in chemical dynamics as well as active researchers who wish to acquire a wider knowledge of the field.


A Practical Guide to Kinetic Monte Carlo Simulations and Classical Molecular Dynamics Simulations

A Practical Guide to Kinetic Monte Carlo Simulations and Classical Molecular Dynamics Simulations
Author: Uwe Burghaus
Publisher:
Total Pages: 0
Release: 2006
Genre: Molecular dynamics
ISBN: 9781594545313

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The guidelines of this textbook are numerous example programs, flux diagrams, schemes, and figures presenting the obtained results. Step by step, the authors explain how steady state Monte Carlo Simulation (MCS) and time resolved, so-called kinetic or dynamic Monte Carlo Simulation (KMCS), schemes, respectively, can be set up. Furthermore, examples of classical Molecular Dynamics Simulations (MDS) are included. In addressing the same type of problem by way off all these methods, the different schemes can directly be compared. For the example programs, they have chosen problems related to the adsorption of gas-phase species on surfaces (i.e. mainly lattice models related to gas-surface adsorption dynamics). Furthermore, the growth of deposits on grid surfaces has been address including fractal growth phenomena.


Recent Advances in Density Functional Methods

Recent Advances in Density Functional Methods
Author: Delano Pun Chong
Publisher: World Scientific
Total Pages: 344
Release: 1995
Genre: Mathematics
ISBN: 9789810231606

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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.