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Author : Richard Henry Clarke (Jr)
Publisher :
ISBN 13 :
Total Pages : 125 pages
Book Rating : 4.:/5 (244 download)
Download or read book Spectroscopic Studies of Triplet Excitons in Organic Molecular Crystals written by Richard Henry Clarke (Jr) and published by . This book was released on 1969 with total page 125 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Vladimir L. Broude
Publisher : Springer
ISBN 13 : 9783642882203
Total Pages : 0 pages
Book Rating : 4.8/5 (822 download)
Download or read book Spectroscopy of Molecular Excitons written by Vladimir L. Broude and published by Springer. This book was released on 1985 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Low-temperature spectroscopy of organic molecular crystals came into being in the late 20s, just when quantum physics of solids as a whole began to de velop vigorously. Already in the early works, two experimental facts of prime importance were discovered: the presence of a multitude of narrow bands in the low-temperature spectrum of a crystal, and a close relationship between the spectrum of the crystal and that of the constituent molecules. These findings immediately preceded the celebrated paper of Frenkel in which he went beyond the framework of Bloch's scheme and advanced the exciton concept. Subsequent investigations showed that the most interesting features of the spectra of molecular crystals are associated with excitons, and then the spectroscopy of molecular excitons began to form gradually on the basis of the spectroscopy of organic crystals. The molecular exciton became synonymous to the Frenkel exciton in a molecular crystal. In view of the difficulties involved in the analysis of rich spectra con taining many tens of bands, the spectroscopy of molecular crystals had long been connected most closely with the spectroscopy of molecules. It had deve loped independently, to a large extent, from the other branches of solid state physics. This was also emphasized by the difference in experimental techniques, the specific properties of the objects, etc. As a result, there was some lag in ideas and concepts.
Author : N.I. Ostapenko
Publisher : Springer Science & Business Media
ISBN 13 : 940111675X
Total Pages : 266 pages
Book Rating : 4.4/5 (11 download)
Download or read book Spectroscopy of Defects in Organic Crystals written by N.I. Ostapenko and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt: Spectroscopy of Defects in Organic Crystals presents a masterly summary of the widespread and voluminous literature on the subject, presenting theoretical and experimental investigations of electron and vibronic optical spectra of organic crystals. Electronic states of defects combine to form crystal near-to-band and band levels. These are discrete states in the vicinity of exciton bands, surface and dislocational excitons, etc. Some studies have expressed dissimilar or even conflicting opinions about the nature of observed phenomena. In the choice of the material, preference has been given to phenomena which have received a theoretical interpretation. Some attention is paid to observations which are not completely understood and also to effects predicted but not yet confirmed. The monograph will be useful for scientists as well as undergraduate and postgraduate students of solid state physics.
Author : O. Sild
Publisher : Elsevier
ISBN 13 : 1483284751
Total Pages : 255 pages
Book Rating : 4.4/5 (832 download)
Download or read book Molecular Spectroscopy—XI written by O. Sild and published by Elsevier. This book was released on 2017-01-31 with total page 255 pages. Available in PDF, EPUB and Kindle. Book excerpt: Molecular Spectroscopy–XI provides information pertinent to the fundamental aspects of molecular spectroscopy. This book discusses the modifications of molecular spectra when the density varies as a function of temperature and pressure. Organized into 15 chapters, this book begins with an overview of the several processes concerning triplet excitons leading to magnetic-field sensitive luminescence in organic crystals and related compounds. This text then examines the methods of investigation of the exciton band structures in molecular crystals. Other chapters consider the conditions for the equivalence of Fourier spectroscopy and of slow passage experiments in nuclear magnetic resonance. This book discusses as well the application of computer technology in carbon-13 magnetic resonance spectroscopy. The final chapter deals with the application of high-resolution proton and carbon-13 n.m.r. spectroscopy for the investigation of the molecular conformations in proteins. This book is a valuable resource for organic chemists, biologists, microbiologists, scientists, and research workers.
Author : Pooja Bhagwan
Publisher : Mittal Publications
ISBN 13 : 9788182930124
Total Pages : 278 pages
Book Rating : 4.9/5 (31 download)
Download or read book A Handbook of Molecular Spectroscopy written by Pooja Bhagwan and published by Mittal Publications. This book was released on 2005 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : 黃俊穎
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (128 download)
Download or read book Time-resolved Spectroscopic Studies of Triplet-exciton Kinetics in Organic Materials written by 黃俊穎 and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : A.A. Kaplyanskii
Publisher : Elsevier
ISBN 13 : 0444598278
Total Pages : 767 pages
Book Rating : 4.4/5 (445 download)
Download or read book Spectroscopy of Crystals Containing Rare Earth Ions written by A.A. Kaplyanskii and published by Elsevier. This book was released on 2012-12-02 with total page 767 pages. Available in PDF, EPUB and Kindle. Book excerpt: ``Spectroscopy of Crystals Containing Rare Earth Ions'' contains chapters on some key problems selected from a broad range of spectroscopic studies of RE-activated solids including both crystalline and glassy materials. Progress in crystal field theory is surveyed, an area which is basic to our understanding of the energy levels. The treatment of dynamical properties includes studies of coherence phenomena in isolated ions, energy transfer between ions and co-operative phenomena associated with ion-ion and ion-lattice interactions. In addition, the role of electron spins and nuclear spins is studied by light scattering and double resonance techniques. The presence of inhomogeneous broadening of spectral lines is observed and studied in many contexts, leading to new insights into general problems of the disordered state. Considerable attention is devoted to describing new experimental techniques whose development is of prime importance for progress in the spectroscopy of RE-activated solids. Many of these rely on the development and application of tunable lasers. At the moment this is a very active field of spectroscopy with more exciting developments likely to occur in the future.
Author : A. B. Zahlan
Publisher : Cambridge University Press
ISBN 13 : 0521068924
Total Pages : 566 pages
Book Rating : 4.5/5 (21 download)
Download or read book The Triplet State written by A. B. Zahlan and published by Cambridge University Press. This book was released on 1967-11-02 with total page 566 pages. Available in PDF, EPUB and Kindle. Book excerpt: This 1967 volume brought together knowledge concerning the triplet state and defined the problems in need of solution.
Author :
Publisher :
ISBN 13 :
Total Pages : 494 pages
Book Rating : 4.3/5 ( download)
Download or read book Research in Progress written by and published by . This book was released on 1973 with total page 494 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Edgar A. Silinsh
Publisher : Springer Science & Business Media
ISBN 13 : 3642814646
Total Pages : 404 pages
Book Rating : 4.6/5 (428 download)
Download or read book Organic Molecular Crystals written by Edgar A. Silinsh and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is based on the results of many years of experimental work by the author and his colleagues, dealing with the electronic properties of organic crystals. E. Silinsh has played a leading role in pOinting out the importance of the polarization energy by an excess carrier, in determining not only the character of the carrier mobility in organic crystals, but in determining the band gap and the nature of the all-important trapping site in these crystals. The one-electron model of electronic conductivity that has been so successful in dealing with inorganic semiconductors is singular ly unsuccessful in rationalizing the unusual physical properties of organic crystals. A many-body theory is required, and the experimental manifestation of this is the central role played by the crystal polarization enerqies in transferring the results obtained with the isolated molecule, to the solid. The careful studies of E. Silinsh in this field have shown tn detail how this polarization energy develops around the excess carrier (and also the hole-electron pair) sitting on a molecular site in the crystal. As with all insulators, trapping sites playa dominant role in reducing the magnitude of ~he current that can theoretically pass through the organic crystal. It is usually the case that these trapping sites are energetically distributed within the forbidden band of the crystal. For many years, an exponential distribution has shown itself to be useful and reasonably correct: However,' E.
Author : Vladimir Agranovich
Publisher : International Monographs on Ph
ISBN 13 : 0199234418
Total Pages : 513 pages
Book Rating : 4.1/5 (992 download)
Download or read book Excitations in Organic Solids written by Vladimir Agranovich and published by International Monographs on Ph. This book was released on 2009-02-12 with total page 513 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book provides a detailed and uniform treatment of the science and technology of light absorbing organic materials (used in nano-scale optical devices, LEDs, solar cells, flat screens, cell phones etc), which are increasingly investigated for use in mass market products.
Author :
Publisher :
ISBN 13 :
Total Pages : 738 pages
Book Rating : 4.:/5 (31 download)
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1979 with total page 738 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author : P. Reineker
Publisher : Springer Science & Business Media
ISBN 13 : 3642821413
Total Pages : 292 pages
Book Rating : 4.6/5 (428 download)
Download or read book Organic Molecular Aggregates written by P. Reineker and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains the talks presented at the International Symposium on Electronic Excitations and Interaction Processes in Organic Molecular Aggre gates which was held at Schloss Elmau, Bavaria, Germany from June 5 to June 10, 1983. In the recent years the investigation of organic materials has developed rapidly and has led to the construction of materials with interesting proper ties. The discovery of highly conducting and superconducting organic materials is definitely one of the reasons for the enormous increase in research acti vity in this field. Interesting applications have been realized or seem pos sible, such as the application of organic materials in electrophotography. The conductivity of organic polymers may be varied within a large range by doping and such materials have been used to construct an organic battery. Some time ago it was suggested that organic glasses and polymers could be used as stor age materials in computer technology. With the development of preparation tech niques and modern methods of investigation, for example, high resolution and picosecond spectroscopy, a large amount of experimental data is available not only for the conducting materials but also for organic semiconductors and in sulators. With this rapid accumulation of experimental material the microscopic theoretical understanding could not keep pace.
Author : United States. Army Research Office
Publisher :
ISBN 13 :
Total Pages : 412 pages
Book Rating : 4.3/5 ( download)
Download or read book Research in Progress written by United States. Army Research Office and published by . This book was released on 1966 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vols. for 1977- consist of two parts: Chemistry, biological sciences, engineering sciences, metallurgy and materials science (issued in the spring); and Physics, electronics, mathematics, geosciences (issued in the fall).
Author : J. Fünfschilling
Publisher : Springer Science & Business Media
ISBN 13 : 9400908636
Total Pages : 282 pages
Book Rating : 4.4/5 (9 download)
Download or read book Relaxation Processes in Molecular Excited States written by J. Fünfschilling and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt: Relaxation phenomena of excited molecular states are abundant in all nature. They mediate such key processes as photochemical reactions or even the pathways of ordinary chemical reactions. However, for a long time the main research in electronic relaxation processes was concerned with anorganic solids, in part because of their great technological importance (photography, semiconductors ... ) in part also because these compounds were the "workhorses" of the solid state physicists. In the last 30 years, there was a steadily increasing interest in organic molecular systems, first in molecular crystals and later in all forms of molecular solids (glasses, polymers, membranes, ... ). The present volume combines papers on quite different types of relaxation phenomena: the type of solid studied, the electronic states involved, the physical processes responsible for the relaxations are all different. Nevertheless, after reading this book, a more clear and complete picture of the phenomenon "relaxa tion" emerges that proves that this volume is more than just a collection of individual articles. The volume starts with the paper "Spin-lattice and spin-spin relaxation in photo-excited triplet states in molecular crystals" by Jan Schmidt. Even in these seemingly simple systems of isolated guest molecules in a single crystal host, the relaxation phenomena are quite involved and a very thorough investigation is necessary to find the key relaxation processes. The end of the article provides a bridge to the following paper: it treats interactions of two molecules (dimers), where resonant interactions become important and lead to new, characteristic relaxation processes.
Author : Alessandro Bencini
Publisher : Springer Science & Business Media
ISBN 13 : 3642745997
Total Pages : 299 pages
Book Rating : 4.6/5 (427 download)
Download or read book Electron Paramagnetic Resonance of Exchange Coupled Systems written by Alessandro Bencini and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is intended to collect in one place as much information as possible on the use of EPR spectroscopy in the analysis of systems in which two or more spins are magnetically coupled. This is a field where research is very active and chemists are elbow-to-elbow with physicists and biologists in the forefront. Here, as in many other fields, the contributions coming from different disciplines are very important, but for active researchers it is sometimes difficult to follow the literature, due to differences in languages, and sources which are familiar to, e. g. , a physicist, are exotic to a chemist. Therefore, an effort is needed in order to provide a unitary description of the many different phenomena which are collected under the title. In order to define the arguments which are treated, it is useful to state clearly what is not contained here. So we do not treat magnetic phenomena in conductors and we neglect ferro- and antiferromagnetic resonance. The basic foundations of EPR spectroscopy are supposed to be known by the reader, while we introduce the basis of magnetic interactions between spins. In the first two chapters we review the foundations of exchange interactions, trying to show how the magnetic parameters are bound to the electronic structure of the interacting centers.
Author : Richard H. Clarke
Publisher : John Wiley & Sons
ISBN 13 :
Total Pages : 584 pages
Book Rating : 4.:/5 (42 download)
Download or read book Triplet State ODMR Spectroscopy written by Richard H. Clarke and published by John Wiley & Sons. This book was released on 1982 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt:
