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Měření čistoty jódu v absorpčních kyvetách pro frekvenční stabilizaci laserů
Hrabina, Jan ; Petrů, František ; Jedlička, Petr ; Číp, Ondřej ; Lazar, Josef
In the contribution we present a system for measurement of iodine purity by means excitation of a selected strong transition, measurement of induced fluorescence and evaluation by the Stern-Volmer formula. The arrangement is based on a pumping Ar-ion laser tuned to the transition of interest but its linewidth far exceeds the transition. Frequency noise of the laser is effectivelly reduced by monitoring the fluorescence in a second, reference iodine cell and together with monitoring of the laser power enables cancelation of the frequency noise influence which generates errors by demodulating on the absorption profile. The level of the scattered light is subtracted as well. All the measured data are digitally processed and the experiment is fully computer controlled.
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Příběh Georga Placzka (Nová fakta o jeho pozoruhodném životě a práci)
Gottvald, Aleš
The world's distinguished theoretical physicist Georg Placzek (1905-1955) cooperated with many legendary physicists of the first half of the twentieth century, yet this native of Brno is almost unknown in his homeland. Placzek's contributions to theoretical physics are important and still vivid. He was also an active participant of a number of history-making moments. In particular, he was a leader of a theoretical group in the Manhattan project – as the only citizen of Czechoslovakia. We bring many new facts, documents and photographs about Georg Placzek, his remarkable life, work and family. Many of these materials have never been published elsewhere.
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Řádkový CCD sensor ILX511 pro fyzikální měření
Bartoněk, L. ; Keprt, Jiří
The practical use of the CCD linear image sensor ILX511 for scanning of light in some optical applications (spectroscopy) is presented. Communication of the equipment (CCD linear image sensor) with computer is realized with the help of parallel interface of a personal computer (PC) without additive interface card. The use of the linear detector is presented in the case of detection of the optical spectrum of the mercury lamp.
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Secondary electron contrast of doped regions in semiconductor
Čižmár, Petr
The aim of the dissertation is study of multi-channel spectroscopy of electrons (secondary, both elastically and non-ellastically reflected as well as the Auger ones) in a scanning electron microscope with respect to the signal-to-noise ratio in detected signals. Another aim is to write software for electronic processing of an image of a specimen providing combined analytical and microscopic information. Verification of the methodology at an ultra-high vacuum microscope with slow electrons, which will be equipped with a parallel hyperbolic electrons analyzer in the scope of the project, is one of main goals of the experimental part.
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