Licht und Materie Ib / Light and Matter Ib PDF Download
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Author: J.L. Birman
Publisher: Springer Science & Business Media
ISBN: 3662122707
Category : Science
Languages : en
Pages : 553
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Author: J.L. Birman
Publisher: Springer Science & Business Media
ISBN: 3662122707
Category : Science
Languages : en
Pages : 553
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Book Description
Author: H. Bilz
Publisher: Springer Science & Business Media
ISBN: 3642464335
Category : Science
Languages : en
Pages : 614
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Book Description
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.
Author: Hermann Haken
Publisher: Springer Science & Business Media
ISBN: 3662220911
Category : Science
Languages : en
Pages : 337
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Book Description
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.
Author: L. Genzel
Publisher: Springer Science & Business Media
ISBN: 3642460747
Category : Science
Languages : en
Pages : 344
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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
Author: S. Flügge
Publisher: Springer
ISBN: 3662353938
Category : Science
Languages : fr
Pages : 972
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Author: Siegfried Flügge
Publisher:
ISBN:
Category : Physics
Languages : en
Pages : 624
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Author:
Publisher:
ISBN:
Category : Optical instruments
Languages : en
Pages : 528
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Author: Melvil Dewey
Publisher:
ISBN:
Category : Libraries
Languages : en
Pages : 762
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Book Description
Includes, beginning Sept. 15, 1954 (and on the 15th of each month, Sept.-May) a special section: School library journal, ISSN 0000-0035, (called Juniorlibraries, 1954-May 1961). Issued also separately.
Author:
Publisher:
ISBN:
Category : Libraries
Languages : en
Pages : 1470
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Author:
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ISBN:
Category : American literature
Languages : en
Pages : 360
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