Download or read book Light and Matter Id Licht und Materie Id written by H. Bilz and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 614 pages. Available in PDF, EPUB and Kindle. Book excerpt: The dynamical properties of solids have recently attracted renewed interest in connection with the increasing understanding of phase transitions and re lated phenomena. In particular, soft modes or, more generally, phonon 'anom alies' seem to play an important role in structural and electronic phase tran sitions, such as ferroelectric or superconducting transitions. The understanding of the mechanisms responsible for the occurrence of unusually low frequencies in phonon spectra requires a detailed analysis of the microscopic forces governing the lattice vibrations. Of particular importance is the influence of the electron lattice interaction in the adiabatic approximation which in many cases is the origin of peculiarities in the phonon self-energy. In this work the vibrational spectra of pure non-metals and of those con taining point defects are investigated. ' In these materials the interrelation be tween the pseudo-harmonic forces (determining the phonon dispersion re lations) and the non-linear anharmonic and electron-phonon forces (as they act in infrared and Raman spectra) is most obvious and can be quantitatively analysed in terms of appropriate models. The main task is to arrive at a physically correct treatment of electronic degrees of freedom, as for example in an electronic 'shell' model, which leads to the description of phonon spectra in terms of long-range polarizabilities and short-range deformabilities. The pur pose of our review is to stimulate further investigations which, we hope, will result in explicit relations between the parameters of the semi-microscopic models and the matrix elements from the electronic band structure.
Download or read book Fullerenes and Relative Materials written by Natalia Kamanina and published by BoD – Books on Demand. This book was released on 2018-04-25 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the period of rapid and intensive development of general electronics, this book entitled Fullerenes and Relative Materials - Properties and Applications is quite systematic and useful. It considers some aspects on synthesis, structural, vibrational, tribology, and optical properties of the fullerenes and relative materials. Some parts of the book present the specific area of the applications of the studied nanostructures. The book contains eight chapters. The special approach and interesting results on the unique properties of the materials studied as well as the different areas of their applications in general optoelectronics, solar energy and gas storage, laser and display, and biomedicine are shown. It is important for education process and for the civil and special device operations.
Download or read book Theory of Crystal Space Groups and Lattice Dynamics written by J. L. Birman and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 558 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reissue of Encyclopedia of Physics/Handbuch der Physik, Vol. XXV/2b I am very pleased that my book is now to be reprinted and rebound in a new format which should make it accessible at a modest price to students and active researchers in condensed matter physics. In writing this book I had in mind an audience of physicists and chemists with no previous deep exposure to symmetry analysis of crystalline matter, non to the use of symmetry in simplifying and refining predictions of the results of optical experiments. Hence the book was written to explain and illustrate in all necessary detail how to: 1) describe the space group symmetry in terms of space group symmetry operations; 2) obtain irreducible representations and selection rules for optical infra-red and Raman and other transition processes. On the physical side I redeveloped the traditional theory of classical and quantum lattice dynamics, illustrating how space-time symmetry designations in the equations of motion can: 1) simplify and rationalize calculations of the classical eigenvectors of the dynamical equation; 2) permit classification of the eigenstates of the quantum lattice-dynamic pro blem; 3) give specific selection rules for optical infra-red and Raman lattice processes, and thus make "go, no-go" predictions including polarization of absorbed or scattered radiation; and 4) simplify the modern many-body theories of optical processes.
Download or read book Light and Matter Ia Licht und Materie Ia written by L. Genzel and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt: 159 elements only between states which differ in one of the single-electron wave functions, in short, HeR induces only one-electron transitions. The matrix elements 1mn and Pmn reduce to matrix elements between the single-electron wave functions. We are interested primarily in crystalline solids for which the band model is a good approximation. The Bloch single-electron wave function in this model has the form: N'I ili-';; U. r.;;) ( (1.14) ""nk r, =e nh\r , where n is the band index and U (r) has the periodicity of the lattice. The form of the Bloch function follows from the translational symmetry of the crystal, and the matrix elements between Bloch states are subject to the condition of wave-vector conservation: k'=k, for
Download or read book Light and Matter Ic Licht und Materie Ic written by Hermann Haken and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 337 pages. Available in PDF, EPUB and Kindle. Book excerpt: The concept of the laser came into existence more than a decade ago when ScHAWLOW and TowNES showed that the maser principle could be extended to the optical region. Since then this field has developed at an incredible pace which hardly anybody could have foreseen. The laser turned out to be a meeting place for such different disciplines as optics (e.g. spectroscopy), optical pumping, radio engineering, solid state physics, gas discharge physics and many other fields. The underlying structure of the laser theory is rather simple. The main questions are: what are the light intensities (a), what are the frequencies (b), what fluctua tions occur (c), or, in other words, what are the coherence properties. Roughly speaking these questions are treated by means of the rate equations (a), the semiclassical equations (b), and the fully quantum mechanical equations (c), respectively. The corresponding chapters are written in such a way that they can be read independently from each other. For more details about how to proceed, the reader is advised to consult Chap. I.4.
Download or read book Licht und Materie Ib Light and Matter Ib written by J.L. Birman and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 553 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Licht und Materie Ib written by and published by . This book was released on 1974 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Light and Matter II Licht und Materie II written by S. Flügge and published by Springer. This book was released on 1959-01-16 with total page 965 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Light and Matter II Licht und Materie II written by S. Flügge and published by Springer. This book was released on 2013-12-01 with total page 972 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Licht und Materie Ib Light and Matter Ib written by Joseph Birman and published by Springer. This book was released on 2014-03-12 with total page 540 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Encyclopedia of Physics written by S. Flü gge and published by . This book was released on 1984 with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Handbuch der Physik pt 2a c Licht und Materie Ia Ic written by Siegfried Flügge and published by . This book was released on 1955 with total page 624 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Licht und Materie 1a written by Ludwig Genzel and published by . This book was released on 1967 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Handbuch der Physik 25 2d Licht und Materie written by H. Bilz and published by Springer Verlag. This book was released on 1984 with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Historical Studies in the Physical and Biological Sciences written by and published by . This book was released on 2004 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Englisch Deutsches und Deutsch written by Christoph Friedrich Grieb and published by . This book was released on 1861 with total page 1108 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Deutsch englisches und englisch deutsches W rterbuch written by Christoph Fr Grieb and published by . This book was released on 1873 with total page 1100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
