Perturbations in the Spectra of Diatomic molecules

Author: Helene Lefebvre-Brion
Publisher: Elsevier
ISBN: 0323150764
Format: PDF, ePub, Mobi
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Perturbations in the Spectra of Diatomic Molecules examines in sufficient detail the spectrum of every diatomic molecule. This book is divided into seven chapters. Chapter 1 describes the perturbations and simple procedures for evaluating matrix elements of angular momentum. The terms in the molecular Hamiltonian that are responsible for perturbations are elaborated in Chapter 2, while the process of reducing spectra to molecular constants and the difficulty of relating empirical parameters to terms in the exact molecular Hamiltonian are described in Chapter 3. Chapter 4 discusses the magnitudes and physical interpretations of matrix elements. The transition intensities, especially quantum mechanical interference effects, are reviewed in Chapter 5. The last two chapters are devoted to the two forms of perturbation—predissociation and autoionization. This publication is a good source for graduate students, theorists, experimentalists, and potential users of spectroscopic data.

The Spectra and Dynamics of Diatomic Molecules

Author: Helene Lefebvre-Brion
Publisher: Elsevier
ISBN: 0080517501
Format: PDF, Docs
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This book is written for graduate students just beginning research, for theorists curious about what experimentalists actually can and do measure, and for experimentalists bewildered by theory. It is a guide for potential users of spectroscopic data, and uses language and concepts that bridge the frequency-and time-domain spectroscopic communities. Key topics, concepts, and techniques include: the assignment of simple spectra, basic experimental techniques, definition of Born-Oppenheimer and angular momentum basis sets and the associated spectroscopic energy level patterns (Hund's cases), construction of effective Hamiltonian matrices to represent both spectra and dynamics, terms neglected in the Born-Oppenheimer approximation (situations intermediate between Hund's cases, spectroscopic perturbations), nonlinear least squares fitting, calculation and interpretation of coupling terms, semi-classical (WKB) approximation, transition intensities and interference effects, direct photofragmentation (dissociation and ionization) and indirect photofragmentation (predissociation and autoionization) processes, visualization of intramolecular dynamics, quantum beats and wavepackets, treatment of decaying quasi-eigenstates using a complex Heff model, and concluding with some examples of polyatomic molecule dynamics. Students will discover that there is a fascinating world of cause-and-effect localized dynamics concealed beyond the reduction of spectra to archival molecular constants and the exact ab initio computation of molecular properties. Professional spectroscopists, kinetics, ab initio theorists will appreciate the practical, simplified-model, and rigorous theoretical approaches discussed in this book. Key Features: • A fundamental reference for all spectra of small, gas-phase molecules. • It is the most up-to-date and comprehensive book on the electronic spectroscopy and dynamics of diatomic molecules. • The authors pioneered the development of many of the experimental methods, concepts, models, and computational schemes described in this book. A fundamental reference for all spectra of small, gas-phase molecules. It is the most up-to-date and comprehensive book on the electronic spectroscopy and dynamics of diatomic molecules. The authors pioneered the development of many of the experimental methods, concepts, models, and computational schemes described in this book.

The Spectra and Dynamics of Diatomic Molecules

Author: Hélène Lefebvre-Brion
Publisher: Academic Press
ISBN: 9780124414556
Format: PDF, Docs
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And concluding with some examples of polyatomic molecule dynamics. P Students will discover that there is a fascinating world of cause-and-effect localized dynamics concealed beyond the reduction of spectra to archival molecular constants and the exact ab initio computation of molecular properties.-

The Iodine Molecule

Author: Sergey Lukashov
Publisher: Springer
ISBN: 3319700723
Format: PDF
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This book presents experimental and theoretical spectroscopic studies performed over the last 25 years on the iodine molecule’s excited states and their perturbations. It is going to be of interest to researchers who study intra- and intermolecular perturbations in diatomic molecules and more complex systems. The book offers a detailed treatment of the nonadiabatic perturbations of valence, ion-pair and Rydberg states induced by intramolecular as well as intermolecular interactions in collisions or in weakly-bound complexes. It also provides an overview of current instrumentation and techniques as well as theoretical approaches describing intra- and intermolecular perturbations. The authors are experts in the use of spectroscopy for the study of intrinsic and collision-induced perturbations in diatomic iodine. They introduced a new method of three-step optical population of the iodine ion-pair states. The iodine molecule has 23 valence states correlating with three dissociation limits, 20 so-called ion-pair states, nestled in four tiers and a multitude of Rydberg states. All the states have different angular momenta, parities and very dense rovibronic levels. Moreover, perturbations caused by atomic or molecular partners lead to effective nonadiabatic transitions. For these reasons the authors propose this molecule as a model system for spectroscopic studies of intra- and intermolecular perturbations in other diatomic molecules.

Optical Electric and Magnetic Properties of Molecules

Author: D.C. Clary
Publisher: Elsevier
ISBN: 9780080538068
Format: PDF
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This book celebrates the career and scientific accomplishments of Professor David Buckingham, who is due to retire from his Chair at Cambridge University in 1997. The adopted format comprises reprints of a number of David Buckingham's key scientific papers, each one or two of these preceded by a review of the corresponding area of David's wide-ranging research interest. Each reviewer is recognised as an expert in that field of interest and has some close association with David Buckingham, as a scientific colleague and/or a former research student. The book should serve as a distinctive reference source, both retrospective and prospective, for the field of chemical physics with which the name A.D. Buckingham is associated. The editors opted to reprint a majority of early classic Buckingham papers, balanced by some of David Buckingham's more recent publications. Reprinted papers have been placed into a general scientific context that covers prior influences on, and later impacts by, the work nominated for review.

Rotational Spectroscopy of Diatomic Molecules

Author: John M. Brown
Publisher: Cambridge University Press
ISBN: 9780521530781
Format: PDF
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Diatomic molecules are important across the whole of the physical sciences. They are the basic building blocks of large molecules and many of the principles which underlie our understanding of chemical bonds in molecules were first developed by studying diatomic systems. Starting from fundamental principles, this book develops the theory behind the energy levels of diatomic molecules and then summarises the many experimental methods used to study the spectra of these molecules in the gaseous state. This book will be the definitive text in the field.

High Resolution Fourier Transform Spectroscopy of Linear Molecules

Author: K. A. Mohamed
Publisher: Nova Publishers
ISBN: 9781594541711
Format: PDF, ePub
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High resolution Fourier transform spectra of linear molecules have evoked a great deal of interest during the last several years, which could be seen from the several hundreds of papers published in the journal on the spectra of diatomic and small linear polyatomic molecules. This book describes the advantages of FT Spectroscopy, the techniques employed in absorption and emission spectroscopy, and presents the theoretical models and formulas used in the analyses and interpretation of the spectra. The Perturbations observed in the spectra due to Fermi, Darling-Dennison, Coriolis, and other anharmonic resonances; and vibrational and rotational l-type resonances etc. are discussed with suitable examples. The types of information obtained from FT spectroscopy of two to ten atomic linear molecules, their observed transitions and spectral perturbation etc. are presented along with figures and curves.

Molecular Quantum Mechanics

Author: Peter W. Atkins
Publisher: Oxford University Press
ISBN: 0199541426
Format: PDF, Mobi
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This text unravels those fundamental physical principles which explain how all matter behaves. It takes us from the foundations of quantum mechanics, through quantum models of atomic, molecular, and electronic structure, and on to discussions of spectroscopy, and the electronic and magnetic properties of molecules.

Molecular Spectra and Molecular Structure

Author: Gerhard Herzberg
Publisher: Read Books Ltd
ISBN: 1446549143
Format: PDF, Kindle
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TEXT BOOK MOLECULAR SPECTRA and MOLECULAR STRUCTURE I. SPECTRA OF DIATOMIC MOLECULES by GERHARD HERZBERG. Originally published in 1939. PREFACE: Eleven years ago I published a volume entitled Molecular Spectra and Molecular Structure I. Diatomic Molecules which was followed in 1945 by a second volume Infrared and Raman Spectra of Polyatomic Molecules. The first volume has been out of print for a number of years but the demand for it seemed to justify a new edition. Although the book has been completely revised and brought up to date, its general plan has remained substantially unchanged. Concerning this plan it seems therefore appropriate to quote from the preface of the first edition I have endeavored to give a presentation which is readable by the beginner in the field and also will be useful to those who do or want to do research work in this field. In order to assist the former, I have frequently made use of small type for those sections that are not necessary for an understanding of the fundamentals. For the benefit of those working in the field, numerous references to original papers have been included. A satisfactory presentation of molecular spectra and molecular structure is nowadays not possible without treating thoroughly, apart from the empirical results, the theoretical background also. Therefore I have included as much of the theory of molecular spectra as is possible without going into the more difficult mathematical details. A large number of diagrams, graphical repre sentations of eigenfunctions and potential curves, as well as energy level dia grams, serve to illustrate and to explain the theory. On the other hand, I have added numerous carefully selected spectrograms of bands and band systems some of which have been taken specially for this purpose in order to give an accurate idea of tho experimental material that forms the basis of the developments. While of course most of the material presented is not new, it seems that the actual procedure followed in analyzing a band spectrum has not previously been given as specifically in a book of this kind. The same holds for the ap plications of band spectra to other parts of physics, to chemistry, and to astro physics given in the last chapter. I hope that both these features will be found useful. In the eleven years since the publication of the first edition the subject Spectra of Diatomic Molecules has developed vigorously even though not as rapidly as in the preceding two decades. Most of the progress made has been consolidation and slow evolution rather than revolution. Exceptions to this statement are the amazing advances made by applying the new tools of molecular beams and microwaves to diatomic molecular problems. Naturally I have incorporated these advances of recent years in the present new edition...