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Radiation corrections to atomic spectra
Patkóš, Vojtěch ; Skála, Lubomír (referee) ; Zamastil, Jaroslav (advisor)
Main aim of this work is calculation of contribution of the selfenergy of electron to atomic spectra. We derive relation for improved Bethe logarithm and perform non-relativistic limit. Then we derive relation for non-relativistic oscillator strengths and recurrence relations for them. This we will use for calculation of Bethe logarithm. Then we derive solution to Dirac equation for electron in Coulomb potential as linear combination of functions whose radial part is similar to non-relativistic hydrogen wave functions. Finally we perform numerical calculation of improved Bethe logarithm for 1s, 2s and 2p states.
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The New Approaches to Teaching of Rudimentes of Quantum Physics
Králík, Jiří ; Skála, Lubomír (advisor) ; Hejnová, Eva (referee) ; Kapsa, Vojtěch (referee)
This thesis is dealing with didactics of quantum theory and its modern trends. It contains a brief overview of problems in quantum physics education and many references to important sources in the field. Part of the thesis is focused on identification of some sources potential misunderstandings in the process of teaching and learning of quantum theory (misconceptions). The next part is devoted to a problem with visualization in microworld and after that I dealing with Feynman's approach to quantum theory, its advantages and disadvantages and I enumerate some pedagogical projets that continues in that direction. In another part I treat to my proposal for using quantum field theory terminology in introductory modern physics courses. The last chapter of the thesis is dealing with my project "The Road under Perception", which is intended as a teaching text about (modern) physics for non-experts. The thesis also contains appendix with excerpt of my article about history of microworld's origins cognition. Powered by TCPDF (www.tcpdf.org)
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Coherence transfer during relaxation in molecular aggregates
Olšina, Jan ; Mančal, Tomáš (advisor) ; Skála, Lubomír (referee)
We study the time dependence of the density operator of molecular aggregates in contact with thermal bath, to find a proper approximation for the description of a coherence transfer influence on this evolution. It is based on results of the computer program, written by the author of the work. The program uses three methods of evaluation - the solution of the convolution Quantum Master Equation, and solution of the derived Redfield equations in Markov and subsequent Secular approximations. The temperature dependence and dependence on other parameters of the model are discussed on the basis of the obtained numerical results performed on an example of a trimer. The influence of coherence transfer on time-evolution superoperator of the trimer is discussed as well. The reasons why the Markov approximation fails for a wide spectrum of parameters are given. It is concluded that it is not suitable for the description of coherence transfer effects.
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Tigh-binding model and its application for molecular electronics and transport in mezoscopic systems
Prachař, Jan ; Čížek, Martin (advisor) ; Skála, Lubomír (referee)
Nazev prace: Model tesne vazby a jeho aplikacc na molekularni eloktroniku a trans- port, v mezoskopiekyoh systemech Autur: Jan Prachaf Katedra (ustav): Ustav tooroticko fyziky Vedouci bakalafske pniee: RNUr. Martin Oizek, Pli.D. E-mail vedouciho: Martin.CizekQmff .cuni . cz Abstrakt V predlozene praci aplikujcino model tesne vazby na molekularni elek- troniku. Prodmetem teoretickeho popisu jc molekularni inustok, c.oz jo .sys- tom jet1no cl nckolika. inolckul, ktore pfoklonuji iie]>atriiou ino/oru uio/i dvema kovovyini votliri. Iiifonriacc o vodirirh potfcbna k iirroni ]>ravdcpo- dolmosti pn'ichudu ski'z iniiHtok jc dana solf-cncrgii vodicu. Illavniin oilom praro jo analyticky vypocitat sflf'-onor^io vybranyoli inudcli'i v ranici nio- tlelu teyno vazby. Pro kazdy modol t.ako urriijemo pravdopodt)bnost pru- cliodn ski"/ molekularni uiustck. V praoi rovuoz studujnuu1 uhlikovo nano- t,rul>icky, material pozoruhodnych vlaslnuHti, s potoiicialni moznoHti vy- uzit.i v mulckulariii oloktronire. 1'otlafilo so /iskat, analyticky vyraz pro scll-oncrgii cik-cak iianolrubicck. Klicova slova: nujdol tosno vaz!)y, niolokulanii inustck, soll'-onergio, uhlikovo iiaiiotni- bicky Tit.lo: Ti^ht-bindiiig model and its application for molecular electronics and transport in me.zosc.opic systems Author: .Ian Prachaf Department:...
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