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@article{1161970, author = {Franta, Daniel and Nečas, David and Zajíčková, Lenka}, article_location = {Oxford}, article_number = {May}, doi = {http://dx.doi.org/10.1016/j.tsf.2013.01.081}, keywords = {Sum rule; Optical constants; Dispersion model}, language = {eng}, issn = {00406090}, journal = {Thin Solid Films}, title = {Application of ThomasReicheKuhn sum rule to construction of advanced dispersion models}, url = {http://dx.doi.org/10.1016/j.tsf.2013.01.081}, volume = {534}, year = {2013} }
TY  JOUR ID  1161970 AU  Franta, Daniel  Nečas, David  Zajíčková, Lenka PY  2013 TI  Application of ThomasReicheKuhn sum rule to construction of advanced dispersion models JF  Thin Solid Films VL  534 IS  May SP  432441 EP  432441 PB  Elsevier Science SN  00406090 KW  Sum rule KW  Optical constants KW  Dispersion model UR  http://dx.doi.org/10.1016/j.tsf.2013.01.081 L2  http://dx.doi.org/10.1016/j.tsf.2013.01.081 N2  The classical fsum rule is generalized using quantum mechanical Thomas–Reiche–Kuhn sum rule to include nucleonic contribution, i.e. lattice vibrations. The sum rule is formulated for the transition strength function defined as a continuous condensedmatter equivalent of the oscillator strength known for discrete transitions in atomic spectra. The application of such formulated sum rule allows construction of dispersion models containing a fitting parameter directly related to the atomic density of material. The dielectric response expressed using the transition strength function is split into individual contributions such as direct and indirect electronic interband transitions including excitonic effect, excitations of electrons to the highenergy states existing above the conduction band, coreelectron excitations and phonon absorption. The presented models reflect understanding of structure of disordered and crystalline materials on the basis of quantum theory of solids. The usual term ‘joint density of states’, that should be used only for electronic transitions in the oneelectron approximation, is replaced by the more general term ‘transition density’. ER 
FRANTA, Daniel, David NEČAS and Lenka ZAJÍČKOVÁ. Application of ThomasReicheKuhn sum rule to construction of advanced dispersion models. \textit{Thin Solid Films}. Oxford: Elsevier Science, 2013, vol.~534, May, p.~432441. ISSN~00406090. doi:10.1016/j.tsf.2013.01.081.
