Excited States V3

Excited States, Volume 3 deals with excited states and covers topics ranging from two-photon molecular spectroscopy in liquids and gases to time evolution of excited molecular states. Product energy distributions in the dissociation of polyatomic molecules are also discussed, along with the mechanism of optical nuclear polarization in molecular crystals and vibronic interactions and luminescence in aromatic molecules with non-bonding electrons.

Comprised of five chapters, this volume begins with a didactic treatment of the theory of simultaneous two-photon absorption spectroscopy from the point of view concerned primarily with molecular gases and liquids. The basic theoretical quantity is shown to be an absorption tensor, as contrasted with the absorption vector of one-photon spectroscopy. The next chapter considers the time evolution of a molecular system interacting with a photon wave packet. The theory is applied to handle photon scattering from several physical models for molecular level structure in excited electronic states of polyatomic molecules. The remaining chapters explore various polyatomic decomposition processes and the basic features governing the internal energy distribution of the fragments; optical nuclear polarization in molecular crystals and vibronic interactions; and luminescence in aromatic molecules with non-bonding electrons.

This book should be of interest to chemists and molecular physicists.

Contenu

List of Contributors
Contents of Previous Volumes
Two-Photon Molecular Spectroscopy in Liquids and Gases
I. Introduction
II. Phenomenology and Applications
III. Reviews
IV. Basic Physics of Two-Photon Absorption
V. Liquids
VI. Gases of Symmetric Rotor Molecules
References
Time-Evolution of Excited Molecular States
I. Prologue
II. Quantum Mechanical Treatment of a Light Pulse
III. General Theory of Photon Counting
IV. The Two-Level System
V. Doorway States and Photon Scattering from a General Molecular Level Scheme
VI. General Expressions for Emission Quantum Yields
VII. Comments on the Relation between Time-Resolved Observables and the Optimal Absorption Lineshape
VIII. Photon Scattering from a Single Molecular Resonance and Effects of Collisional Perturbations
IX. The Effective Hamiltonian and Independently Decaying Levels
X. Time-Resolved Photon Scattering from Large Molecules
XI. Photon Scattering from a Dissociative Continuum
XII. Epilogue
References
Product Energy Distributions in the Dissociation of Polyatomic Molecules
I. Introduction
II. Simple Models of Polyatomic Molecule Dissociation
III. Franck-Condon Transition Amplitude for Molecular Dissociation
IV. Final State Interactions
V. Numerical Calculations and Comparison with Experiments
VI. Generalized Simple Golden Rule Model Derived from Full Quantum Theory
VII. Bending and Rotational Degrees of Freedom
VIII. Applications to Chemical Reactions
References
The Mechanism of Optical Nuclear Polarization in Molecular Crystals
I. Introduction and Definition of Nuclear Polarization
II. Nuclear Spin Polarization Methods
III. Some Physics of Excited Molecular States
IV. Optical Electron Polarization
V. Optical Nuclear Polarization
VI. Optical Nuclear Polarization: Theory
VII. Experimental and Numerical ONP in Phenazine
VIII. Optical Nuclear Polarization by Level Anti-Crossing
IX. Level Anti-Crossing in Doped Fluorene Crystals
X. General Discussion
References
Vibronic Interactions and Luminescence in Aromatic Molecules with Nonbonding Electrons
I. Introduction
II. Vibronic Interactions in the Weak Coupling Limit and Radiative Transitions
III. Vibronic Interactions in the Strong Coupling Limit and Radiative Transitions
IV. Radiationless Transitions
V. Conclusions
References
Author Index
Subject Index