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Sample preparation and their measurement by EDS methods
Kostelník, Tomáš ; Jaššo, Kamil (referee) ; Čudek, Pavel (advisor)
This bachelor´s thesis is focused on preparation and analysis of samples by energy dispersive spectroscopy using scanning electron microscopy. In the theoretical the main differences between environmental scanning electron microscopy and scanning electron microscopy are described. There is also a description of basic knowledge regarding energy dispersive spectroscopy. The generation and detection of signals arising from the interaction of a beam of primary electrons with a sample is also explained, with emphasis on the description, generation and distribution of these signals. The experimental part is focused on sample preparation and analysis.
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Sample preparation and their measurement by EDS methods
Kostelník, Tomáš ; Jaššo, Kamil (referee) ; Čudek, Pavel (advisor)
This bachelor´s thesis is focused on preparation and analysis of samples by energy dispersive spectroscopy using scanning electron microscopy. In the theoretical the main differences between environmental scanning electron microscopy and scanning electron microscopy are described. There is also a description of basic knowledge regarding energy dispersive spectroscopy. The generation and detection of signals arising from the interaction of a beam of primary electrons with a sample is also explained, with emphasis on the description, generation and distribution of these signals. The experimental part is focused on sample preparation and analysis.
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Účinné průřezy srážek elektronů s atomy vodíku
Benda, Jakub ; Houfek, Karel (advisor) ; Zamastil, Jaroslav (referee)
Although the collisions of electrons and atomic hydrogen has been studied for several decades, there is still neither a complete database of scattering data, nor a universal method that would let generate such data. For astronomical and other purposes the cross sections of electron-hydrogen collisions are necessary, in a broad range of energies - from tenths of electronvolt to millions of electronvolts. In this work the author concentrates on several established approaches to electron-atom scattering and confronts results of his own implementations of these methods against the published data and results of freely available computer codes. A special attention is given to the overlaps of different methods, so that in the end a database with easy user interface can be offered for common practical usage of scattering data in applied fields.
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Astrophysically important processes in collisions of electrons with hydrogen atoms
Benda, Jakub ; Houfek, Karel (advisor) ; Stelbovics, Andris (referee) ; Zamastil, Jaroslav (referee)
Jakub Benda Astrophysically important processes in collisions of electrons with hydrogen atoms This thesis focuses on calculations of the cross sections and other scattering quantities that characterize the outcome of collisions of electrons with hydro- gen atoms. For the chosen energy range and atomic transitions the scattering process is solved within the non-relativistic quantum mechanics by discretiz- ation of the Schr¨odinger equation in the basis of B-splines, which transforms the equation into a linear-algebraic problem. The thesis discusses the boundary conditions, methods of solution of the linear system, preconditioning of the sys- tem and interpretation of results, including several original ideas that proved to be very beneficient for the calculations. The calculated data are provided by means of graphs at the end of the thesis. Also, a custom web-based scattering database containing the results has been set up, freely available to the expected audience of this project. 1
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Astrophysically important processes in collisions of electrons with hydrogen atoms
Benda, Jakub ; Houfek, Karel (advisor) ; Stelbovics, Andris (referee) ; Zamastil, Jaroslav (referee)
Jakub Benda Astrophysically important processes in collisions of electrons with hydrogen atoms This thesis focuses on calculations of the cross sections and other scattering quantities that characterize the outcome of collisions of electrons with hydro- gen atoms. For the chosen energy range and atomic transitions the scattering process is solved within the non-relativistic quantum mechanics by discretiz- ation of the Schr¨odinger equation in the basis of B-splines, which transforms the equation into a linear-algebraic problem. The thesis discusses the boundary conditions, methods of solution of the linear system, preconditioning of the sys- tem and interpretation of results, including several original ideas that proved to be very beneficient for the calculations. The calculated data are provided by means of graphs at the end of the thesis. Also, a custom web-based scattering database containing the results has been set up, freely available to the expected audience of this project. 1
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Účinné průřezy srážek elektronů s atomy vodíku
Benda, Jakub ; Houfek, Karel (advisor) ; Zamastil, Jaroslav (referee)
Although the collisions of electrons and atomic hydrogen has been studied for several decades, there is still neither a complete database of scattering data, nor a universal method that would let generate such data. For astronomical and other purposes the cross sections of electron-hydrogen collisions are necessary, in a broad range of energies - from tenths of electronvolt to millions of electronvolts. In this work the author concentrates on several established approaches to electron-atom scattering and confronts results of his own implementations of these methods against the published data and results of freely available computer codes. A special attention is given to the overlaps of different methods, so that in the end a database with easy user interface can be offered for common practical usage of scattering data in applied fields.
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