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Title: Determination of some atomic parameters related to XRF and their applications
Researcher: Gupta, Sheenu
Guide(s): Singla, R M
Mittal, V K
Keywords: Physics
Upload Date: 31-Jul-2013
University: Punjabi University
Completed Date: 2012
Abstract: The work presented in this thesis deals with the determination of some atomic parameters related to X-Ray Fluorescence (XRF) and their applications. newlineX-ray fluorescence is the phenomenon of emission of X-rays as a result of decay of atomic inner shell vacancy created by a bombarding photon of energy greater than the binding energy of the shell electron. The process of photon induced vacancy creation is called photoionization/photoexcitation. The decay of vacancy takes place by the jump of an outer shell electron and the process is called de-excitation that results in fluorescent Xray/ Auger electron emission. The investigations of emitted radiation lead to the exploration of the processes by which the atomic inner shell vacancy is created and filled up. For shells involving a number of sub-shells like L, M and higher shells, there are Coster-Kronig/Super Coster-Kronig transitions occurring before the decay of vacancy by outer shell electron jump. Coster-Kronig transition is the shift of the vacancy in ith subshell to some upper jth sub-shell within the same shell and the energy difference of two involved sub-shells knocks out an outer shell electron. Thus, no X-rays are emitted and atom gets doubly ionized. When the initial vacancy leads to two vacancies in the subshells of same shell, it is called super Coster Kronig transition (Bambynek et al., 1972). The process of creation and filling of vacancies involve various fundamental atomic parameters i.e. photoionization cross-section, fluorescence yield, Coster-Kronig transition probabilities, fractional decay rates etc. In the presence of magnetic field, electron having total angular momentum quantum number j possesses 2j+1 magnetic sub-states mj varying from mj to +mj as projections of j in the magnetic field direction. In an excitation, the number of created vacancies may vary in different magnetic sub-states of a state with jgt1/2, which leads to vacancy alignment (Berezkho and Kabachni k, 1977;Berezkho et al., 1978) and is quantized as alignment parameter, A.
Pagination: xv, 164p.
Appears in Departments:Department of Physics

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02_certificate.pdf136.1 kBAdobe PDFView/Open
03_declaration.pdf107.31 kBAdobe PDFView/Open
04_dedication.pdf2.97 kBAdobe PDFView/Open
05_acknowledgement.pdf405.91 kBAdobe PDFView/Open
06_contents.pdf37.04 kBAdobe PDFView/Open
07_list of figures.pdf68.13 kBAdobe PDFView/Open
08_abstract.pdf47.83 kBAdobe PDFView/Open
09_list of tables.pdf81.89 kBAdobe PDFView/Open
10_chapter 1.pdf273.78 kBAdobe PDFView/Open
11_chapter 2.pdf2.28 MBAdobe PDFView/Open
12_chapter 3.pdf842.47 kBAdobe PDFView/Open
13_chapter 4.pdf353.3 kBAdobe PDFView/Open
14_chapter 5.pdf492.04 kBAdobe PDFView/Open
15_chapter 6.pdf174.06 kBAdobe PDFView/Open
16_conclusion.pdf63.07 kBAdobe PDFView/Open
17_list of publication.pdf46.37 kBAdobe PDFView/Open
18_references.pdf53.32 kBAdobe PDFView/Open

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