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Sunday, July 26, 2020 | History

3 edition of Radiationless transitions in polyatomic molecules found in the catalog.

Radiationless transitions in polyatomic molecules

Medvedev, Ė. S.

Radiationless transitions in polyatomic molecules

by Medvedev, Ė. S.

  • 214 Want to read
  • 33 Currently reading

Published by Springer-Verlag in Berlin, New York .
Written in English

    Subjects:
  • Molecular theory.,
  • Radiationless transitions.

  • Edition Notes

    Includes bibliographical references (p. [339]-366) and index.

    StatementE.S. Medvedev, V.I. Osherov.
    SeriesSpringer series in chemical physics ;, v. 57
    ContributionsOsherov, V. I.
    Classifications
    LC ClassificationsQD461 .M4413 1995
    The Physical Object
    Paginationix, 374 p. :
    Number of Pages374
    ID Numbers
    Open LibraryOL1095376M
    ISBN 100387577696, 3540577696
    LC Control Number94019897

      However, experimental determination of the intersection structure involved in radiationless transitions of a polyatomic molecule is impossible at present. We have discovered a minimum energy crossing point among the three potential energy surfaces (S 1, T 1, and T 2) that appears to be common to a wide variety of aromatic carbonyl compounds. The original Russian edition. Later a revised extended edition was published in English: E.S. Medvedev, V.I. Osherov. Radiationless Transitions in Polyatomic Molecules.

    A general approach for eliminating radiationless transitions (RT) in polyatomic molecules is proposed. The approach is a combination of optimal control theory and electronically localized eigenstates of strongly vibronically coupled systems, to populate a superposition state that is immune to nonradiative decay. The rotational state dependence of indirect photodissociation has been examined in the light of some recent developments in the theory of radiationless transitions in rotating molecules. A simple argument based on projection operators leads to the prediction of sequential kinetics from an initial singlet state through an intermediate triplet.

    Radiationless Transitions in Polyatomic Molecules Radiationless Transitions in Polyatomic Molecules Jortner, J.; Bixon, M. Radiationless transitions in isolated molecules are examined from the point of view of the breakdown of the Born‐Oppenheimer approximation. The intramolecular non‐radiative decay is considered in various limits and the . Vibronic radiationless transitions in large polyatomic molecules can be thought of as a process whereby the molecule, initially prepared in a discrete quasistationary state, makes a transition to an adjoining vibronic continuum belonging to a lower electronic state of the same multiplicity.


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Radiationless transitions in polyatomic molecules by Medvedev, Ė. S. Download PDF EPUB FB2

Radiationless transitions comprise an important class of physical phenomena occurring in the excited states of molecules. They affect the lifetimes of the ex­ cited states and govern primary photochemical and photophysical processes. Much effort has been devoted to the understanding of radiationless transi­ tions.

Radiationless Transitions is a critical discussion of Radiationless transitions in polyatomic molecules book studies on the theory and experiments in radiationless transitions.

This book is composed of nine chapters, and begins with discussions on the theory and experiment of photophysical processes of single vibronic levels and/or single rovibronic levels. Radiationless Transitions is a critical discussion of research studies on the theory and experiments in radiationless transitions.

This book is composed of nine chapters, and begins with discussions on the theory and experiment of photophysical processes of single vibronic levels and/or single rovibronic Edition: 1.

Description Radiationless transitions comprise an important class of physical phenomena occurring in the excited states of molecules. They affect the lifetimes of the ex cited states and govern primary photochemical and photophysical processes. Much effort has been devoted to the understanding of radiationless transi tions.

Abstract Radiationless transitions in isolated molecules are examined from the point of view of the breakdown of the Born‐Oppenheimer approximation. The intramolecular non‐radiative decay is considered in various limits and the radiative decay of coherently excited molecular levels. Radiationless Transitions in Polyatomic Molecules treats the dynamics of electronically excited states and the transition probabilities of electronic relaxation processes.

Book Search tips Selecting this option will search all publications across the Scitation platform Selecting this option will search all Radiationless Transitions in Polyatomic Molecules. This formula shows that the Franck‐Condon factors relevant to the radiationless triplet‐ground‐state transition are governed by CH or CD.

THEORY ON THE RADIATIONLESS TRANSITIONS IN LARGE POLYATOMIC MOLECULES. Photochemistry and Photobiology9 (1), DOI: /jtbx. Schmidt. A Quantum Theory of Energy Dissipation in Molecular Crystals.

Abstract— The stationary perturbation theory of Robinson and Frosch is shown to be inadequate to describe the radiationless transitions in polyatomic molecules. An alternative theory of radiative transfer of excitation energy proposed by Franck and Sponer is considered.

The rates of radiationless transitions between electronic states of porphyrins and their derivatives play a dominant role in their photochemistry because they are the major decay channels of the electronically excited states.

Radiative channels, such as fluorescence, rarely exceed 10% of the overall decay rate constant at room temperature. RADIATIONLESS TRANSITIONS JOSHUA JORTNER Department of Chemistry, Tel-Aviv University, Tel-Aviv, Israel ABSTRACT This review will be concerned with some questions which arise whenever one thinks of analyzing experimental radiative decay times and optical line shape data in polyatomic molecules, and how these quantities are related.

Abstract Radiationless transitionsbetween two electronic states are studied for a system consisting of a polyatomic molecule in a medium where vibrational relaxation is rapid.

The transitionrate is then governed by a vibronic matrix element and a vibrational overlap factor. Traditionally, radiationless transitions in polyatomic molecules were described in a theoretical framework that assumes weak deviations of the nuclear motion from the BO approximation.

The energy gap law for radiationless transitions in large molecules. Molecular Physics: Vol. 18, No. 2, pp. COVID Resources. Reliable information about the coronavirus (COVID) is available from the World Health Organization (current situation, international travel).Numerous and frequently-updated resource results are available from this ’s WebJunction has pulled together information and resources to assist library staff as they consider how to handle.

Abstract. We propose an approach for elimination of radiationless transitions in the excited states of polyatomic molecules. Our method is based on the concept of electronically localized eigenstates of coupled vibronic Hamiltonians—the occurrence of stationary eigenfunctions of essentially pure electronic character in the (otherwise strongly mixed) spectra of excited.

Polyatomic Molecule Vibrational Relaxation Vibronic State Radiative Decay Rate Radiationless Transition These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Excitation energy dependence of radiationless decay rate under collision-free conditions was utilized as a probe of intramolecular vibrational relaxation in tetracene and pentacene. The results give evidence of vibrational relaxation which competes with electronic relaxation.

The substitution dependence of T sub 1(npion*) yields S0 radiationless transition in monocyclic diazines and. Abstract. Vibronic radiationless transitions in large polyatomic molecules can be thought of as a process whereby the molecule, initially prepared in a discrete quasistationary state, makes a transition to an adjoining vibronic con-tinuumbelongingto alowerelectronic state ofthesamemultiplicity.

Inmany. Photon absorption and emission by molecules that undergo radiationless transitions are examined using the single modes of lasers having well-defined coherence properties. Collisional Electronic Transfer from Atoms to Simple Molecules Collisional Electronic Relaxation in Large Polyatomic Molecules Intermolecular Transfer in Condensed Media—Forster Transfer Chapter 9 Radiationless Electronic Transitions in Molecules Spectroscopic Experimental Investigations.G The Energy Gap Law for Radiationless Transitions in Large Molecules.

With R. Englman. Mol. Phys. 18, (). G Theoretical Studies of Radiationless Transitions in Polyatomic Molecules.

J. Chim. Phys. Special Issue "Transitions Non-Radiatives dans les Molecules" (), p. 9. G Electronic Relaxation Processes in Large Molecules.Vibronic spectra involve simultaneous changes in the vibrational and electronic energy states of a molecule.

In the gas phase vibronic transitions are accompanied by changes in rotational energy also. Vibronic spectra of diatomic molecules have been analysed in detail; emission spectra are more complicated than absorption spectra. The intensity of allowed vibronic transitions is .