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Dynamics Of Molecular Excitons

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Dynamics of Molecular Excitons

Dynamics of Molecular Excitons Book
Author : Seogjoo J. Jang
Publisher : Elsevier
Release : 2020-04-25
ISBN : 0081023367
Language : En, Es, Fr & De

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Book Description :

Dynamics of Molecular Excitons provides a comprehensive, but concise description of major theories on the dynamics of molecular excitons, intended to serve as a self-contained resource on the topic. Designed to help those new to this area gain proficiency in this field, experts will also find the book useful in developing a deeper understanding of the subject. The starting point of the book is the standard microscopic definition of molecular Hamiltonians presented in commonly accepted modern quantum mechanical notations. Major assumptions and approximations involved in constructing Frenkel-type exciton Hamiltonians, which are well established, but are often hidden under arcane notations and approximations of old publications, are presented in detail. This will help quantum chemists understand the major assumptions involved in the definition of commonly used exciton models. Rate theories of exciton dynamics, such as Förster and Dexter theories and their modern generalizations, are presented in a unified and detailed manner. In addition, important aspects that are often neglected, such as local field effect and the role of fluctuating environments, are discussed. Various quantum dynamics methods allowing coherent dynamics of excitons are presented in a systematic manner in the context of quantum master equations or path integral formalisms. The author also provides a detailed theoretical explanation for the major spectroscopic techniques probing exciton dynamics, including modern two-dimensional electronic spectroscopy, with a critical assessment of the implications of these spectroscopic measurements. Finally, the book includes a brief overview of major applications including an explanation of organic photovoltaic materials and natural light harvesting complexes. Covers major theories of exciton dynamics in a consciously concise and easily readable way Bridges the gap between quantum dynamics working with phenomenological exciton Hamiltonian and quantum chemistry construct reliable models amenable for dynamics calculations from ab initio calculations Explores modern nonlinear electronic spectroscopy techniques to probe exciton dynamics, showing how it is applied

Exciton Dynamics in Molecular Crystals and Aggregates

Exciton Dynamics in Molecular Crystals and Aggregates Book
Author : Anonim
Publisher : Springer
Release : 2013-11-20
ISBN : 9783662157749
Language : En, Es, Fr & De

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Book Description :

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Exciton Dynamics in Molecular Crystals and Aggregates

Exciton Dynamics in Molecular Crystals and Aggregates Book
Author : Anonim
Publisher : Springer
Release : 2006-04-11
ISBN : 3540390685
Language : En, Es, Fr & De

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Book Description :

Download Exciton Dynamics in Molecular Crystals and Aggregates book written by , available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Exciton Dynamics in Molecular Crystals

Exciton Dynamics in Molecular Crystals Book
Author : Mark Geoffrey Sceats
Publisher : Unknown
Release : 1973
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Exciton Dynamics in Molecular Crystals book written by Mark Geoffrey Sceats, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Charge and Energy Transfer Dynamics in Molecular Systems

Charge and Energy Transfer Dynamics in Molecular Systems Book
Author : Volkhard May,Oliver Kühn
Publisher : Wiley-VCH
Release : 2000-02-22
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Providing a unified description of different transfer phenomena in molecular systems, this volume serves as an introduction for graduate students and researchers. The authors manage to bridge the regimes of coherent and dissipative dynamics and thus establish the connection between classic rate theories and modern treatments of ultrafast phenomena. Starting from microscopic models, the common features of the different transfer processes are highlighted. The applications range from vibrational energy flow in large polyatomics, the motion of protons in solution, up to the concerted dynamics of electronic and nuclear degrees of freedom in molecules and molecular aggregates.

Exciton and Charge Carrier Dynamics in Molecular Semiconductors

Exciton and Charge Carrier Dynamics in Molecular Semiconductors Book
Author : Harald Robert Kerp
Publisher : Unknown
Release : 2001
ISBN : 9789039326060
Language : En, Es, Fr & De

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Book Description :

Download Exciton and Charge Carrier Dynamics in Molecular Semiconductors book written by Harald Robert Kerp, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Dissipative Exciton Dynamics in Light Harvesting Complexes

Dissipative Exciton Dynamics in Light Harvesting Complexes Book
Author : Marco Schröter
Publisher : Springer
Release : 2015-03-18
ISBN : 3658092823
Language : En, Es, Fr & De

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Book Description :

Marco Schröter investigates the influence of the local environment on the exciton dynamics within molecular aggregates, which build, e.g., the light-harvesting complexes of plants, bacteria or algae by means of the hierarchy equations of motion (HEOM) method. He addresses the following questions in detail: How can coherent oscillations within a system of coupled molecules be interpreted? What are the changes in the quantum dynamics of the system for increasing coupling strength between electronic and nuclear degrees of freedom? To what extent does decoherence govern the energy transfer properties of molecular aggregates?.

Triplet Exciton Dynamics in Dibromonaphthalene Molecular Crystals

Triplet Exciton Dynamics in Dibromonaphthalene Molecular Crystals Book
Author : Paulus Marius Hendricus Lambertus Tegelaar
Publisher : Unknown
Release : 1988
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Triplet Exciton Dynamics in Dibromonaphthalene Molecular Crystals book written by Paulus Marius Hendricus Lambertus Tegelaar, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Exciton Dynamics in Self Assembled Molecular Nanotubes

Exciton Dynamics in Self Assembled Molecular Nanotubes Book
Author : Anonim
Publisher : Unknown
Release : 2020
ISBN : 9789403424545
Language : En, Es, Fr & De

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Book Description :

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Ultrafast Exciton Dynamics at Molecular Surfaces

Ultrafast Exciton Dynamics at Molecular Surfaces Book
Author : Anonim
Publisher : Unknown
Release : 2015
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Further improvements to device performance are necessary to make solar energy conversion a compelling alternative to fossil fuels. Singlet exciton fission and charge separation are two processes that can heavily influence the power conversion efficiency of a solar cell. During exciton fission one singlet excitation converts into two triplet excitons, potentially doubling the photocurrent generated by higher energy photons. There is significant discord over the singlet fission mechanism and of particular interest is whether the process involves a multiexciton intermediate state. I used time-resolved two-photon photoemission to investigate singlet fission in hexacene thin films, a model system with strong electronic coupling. My results indicate that a multiexciton state forms within 40 fs of photoexcitation and loses singlet character on a 280 fs timescale, creating two triplet excitons. This is concordant with the transient absorption spectra of hexacene single crystals and definitively proves that exciton fission in hexacene proceeds through a multiexciton state.

Physics Briefs

Physics Briefs Book
Author : Anonim
Publisher : Unknown
Release : 1992
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

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Physica B C

Physica B   C  Book
Author : Anonim
Publisher : Unknown
Release : 1982
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Part B has subtitle: Low temperature and solid state physics and part C has subtitle: Atomic, molecular and plasma physics; optics

Photocurrent Photoluminescence and Exciton Dynamics in Rubrene Molecular Single Crystals

Photocurrent  Photoluminescence and Exciton Dynamics in Rubrene Molecular Single Crystals Book
Author : ByungGook Lyu
Publisher : Unknown
Release : 2013
ISBN : 9781303479106
Language : En, Es, Fr & De

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Book Description :

This work discusses the photocurrent and photoluminescence that can be induced by short-pulse illumination in rubrene single crystals. The pulsed illumination excites a rubrene molecule from the ground state to its first optically accessible excited state, resulting in a singlet exciton state. In rubrene, a singlet exciton can transform into two triplet excitons - which together have a spin of zero - by an efficient spin-conserved fission process. On the other hand, two triplet excitons can interact to again form a singlet exciton by a fusion process. Quantitative modeling of the transformation of singlet excitons into triplet excitons and vice-versa shows that both photoconductivity dynamics and photocurrent dynamics after pulsed excitations can be understood within the same framework. The photoluminescence observed after pulsed excitation is only emitted upon radiative recombination of singlet excitons. A simple model of fission and fusion based on rate equations leads to a qualitatively different photoluminescence dynamics depending on the time scale. In particular, it predicts a fast exponential decay corresponding to the initial fission process, later a power-law (quadratic) decay corresponding to a regime when triplet-triplet interaction is dominant, and a final exponential decay with a time-constant which is half the triplet exciton lifetime. This last exponential decay corresponds to the case when only a lower density of triplet excitons is left. The same model can be used to predict the photocurrent dynamics after pulsed excitation. Experimental observations after pulsed illumination show that, for low excitation pulse energies, a large photocurrent grows exponentially with a time constant of the order of 100 microseconds. This photocurrent build-up time then becomes shorter at higher excitation energies, with the peak photocurrent also saturating. One finds that the observed photocurrent dynamics can be reproduced with the same model based on exciton fission and fusion that successfully explained photoluminescence dynamics. The only additional assumption that is required to do so is that triplet excitons be able dissociate and release free holes by direct interaction with a defect state. The 100 microsecond build-up time of the impulsively induced photocurrent then corresponds to the triplet lifetime.

Directory of Graduate Research

Directory of Graduate Research Book
Author : American Chemical Society. Committee on Professional Training
Publisher : Unknown
Release : 2005
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Faculties, publications and doctoral theses in departments or divisions of chemistry, chemical engineering, biochemistry and pharmaceutical and/or medicinal chemistry at universities in the United States and Canada.

Exciton Dynamics in Perturbed Vibronic Molecular Aggregates

Exciton Dynamics in Perturbed Vibronic Molecular Aggregates Book
Author : Christoph Brüning,Johannes Wehner,Julian Hausner,Michael Wenzel,Volker Engel
Publisher : Unknown
Release : 2016
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Exciton Dynamics in Perturbed Vibronic Molecular Aggregates book written by Christoph Brüning,Johannes Wehner,Julian Hausner,Michael Wenzel,Volker Engel, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Spectroscopy of Molecular Excitons

Spectroscopy of Molecular Excitons Book
Author : Vladimir Lʹvovich Broude,E. I. Rashba,Ėmmanuil Iosifovich Rashba,Elena Fedorovna Sheka,E. F. Eka
Publisher : Springer Verlag
Release : 1985
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Spectroscopy of Molecular Excitons book written by Vladimir Lʹvovich Broude,E. I. Rashba,Ėmmanuil Iosifovich Rashba,Elena Fedorovna Sheka,E. F. Eka, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Electronic Structure and Ultrafast Dynamics in Molecular Films on Metal Surfaces

Electronic Structure and Ultrafast Dynamics in Molecular Films on Metal Surfaces Book
Author : Gregory John Dutton
Publisher : Unknown
Release : 2006
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Electronic Structure and Ultrafast Dynamics in Molecular Films on Metal Surfaces book written by Gregory John Dutton, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Charge and Energy Transfer Dynamics in Molecular Systems

Charge and Energy Transfer Dynamics in Molecular Systems Book
Author : Volkhard May,Oliver Kühn
Publisher : John Wiley & Sons
Release : 2011-04-27
ISBN : 3527633812
Language : En, Es, Fr & De

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Book Description :

This 3rd edition has been expanded and updated to account for recent developments, while new illustrative examples as well as an enlarged reference list have also been added. It naturally retains the successful concept of its predecessors in presenting a unified perspective on molecular charge and energy transfer processes, thus bridging the regimes of coherent and dissipative dynamics, and establishing a connection between classic rate theories and modern treatments of ultrafast phenomena. Among the new topics are: - Time-dependent density functional theory - Heterogeneous electron transfer, e.g. between molecules and metal or semiconductor surfaces - Current flows through a single molecule. While serving as an introduction for graduate students and researchers, this is equally must-have reading for theoreticians and experimentalists, as well as an aid to interpreting experimental data and accessing the original literature.

Population Dynamics of Excitons and Excitonic Molecules

Population Dynamics of Excitons and Excitonic Molecules Book
Author : Masahiro Inoue,Eiichi Hanamura
Publisher : Unknown
Release : 1975
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Population Dynamics of Excitons and Excitonic Molecules book written by Masahiro Inoue,Eiichi Hanamura, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.