Tez özetleri Astronomi ve Uzay Bilimleri Anabilim Dalı

Hyperfine Structure Investigation of Lanthanum I and Vanadium I Elements
In this dissertation, it is mainly aimed to experimentally investigate the hyperfine structure (HFS) of neutral Lanthanum (La I) and neutral Vanadium (V I).
Hyperfine structure of neutral Lanthanum were examined by using high resolution Fourier Transform (FT) Spectroscopy and Laser Induced Fluorescence (LIF) Spectroscopy methods.
In the study of Lanthanum element, firstly high resolution Lanthanum-Argon plasma spectrum was recorded by using Fourier Transform Spectroscopy. The Lanthanum spectrum in the near infrared spectral range of 833 nm -1665 nm was systematically investigated for the first time in this study. As a result of the investigation, it’s classified that 545 spectral lines of which 440 are new of Lanthanum element and 827 spectral lines of which 239 are new of Argon element. The all observed spectral lines, both known from literature and previously unclassified, of Lanthanum and Argon elements in the Fourier spectrum were classified via their expected hyperfine patterns taking into account the selection rules for electric dipole transitions. For all of the already known levels in investigated transitions, the fine structure energy levels were improved more accurately.
In the second part of the study of Lanthanum element, previously unobserved 96 La I spectral lines were accurately identified and confirmed by using Laser Induced Fluorescence Spectroscopy. As a result of the study, 18 new fine structure energy levels of La I were discovered and the magnetic dipole hyperfine structure constants A of the discovered energy levels were determined. Hyperfine structure transitions of several previously unidentified 51 spectral lines observed in Fourier spectrum were classified by looking both centre of gravity wavelengths and their hyperfine structure patterns by using the new discovered energy levels in this study.
The experimental analysis of hyperfine structure of neutral Vanadium element were investigated with high resolution Fourier Transform Spectroscopy. In this part, it is mainly aimed to determine the magnetic dipole hyperfine constants A of the lowest multiplet of odd parity, the ⁶G of the configuration 3d³4s4p. In this study, 16 spectral transitions connecting lower energy levels of 3d³4s4p ⁶G multiplet with upper energy levels of the multiplets 3d³4s5s ⁶F, 3d³4s4d ⁶H and 3d³4s4d ⁶G was observed and analysed. The A magnetic dipol hyperfine structure constants of fine structure energy levels with ⁶G term of the configuration 3d³4s4p were obtained for the first time.

  

AKILLI Mahmut

Tez Adı : EEG Zaman Serilerinde Zayıf Sinyaller

Danışman : Prof. Dr.Gediz AKDENİZ

Anabilim Dalı : Fizik

Programı : Yüksek Enerji ve Plazma Fiziği

Mezuniyet Yılı : 2013

Tez Savunma Jürisi : Prof.Dr.Gediz AKDENİZ

Prof. Dr. Haşim MUTUŞ

Prof. Dr. Hasan TATLIPINAR

Prof. Dr. Handan GÜRBÜZ

Yard. Doç. Dr. Zeynep Ç. ÖNEM