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Identifier 000411945
Title Spin-polarized atoms and molecules in magnetic fields
Alternative Title Πολωμένα άτομα και μόρια σε μαγνητικό πεδίο
Author Καννής, Χρυσοβαλάντης Σ.
Thesis advisor Ρακιτζής Πέτρος-Θεόδωρος
Reviewer Χαραλαμπίδης, Δημήτρης
von Klitzing, Wolf
Abstract The ability to control the spin of electrons and nuclei is of great importance to many scientific and technological fields, such as MRI (Magnetic Resonance Imaging) and the study of nuclear reactions. It is well known that completely polarizing the nuclear spins in the D-T and D- 3He reactions increases the fusion cross section by ~50%; however, such effects have not yet been measured in a plasma, because of the lack of high-density spin polarized atoms. Recently, high-density spin-polarized atoms have been produced by molecular photodissociation, however the standard (optical) methods of detection cannot be used as the sample is too thick. Moreover, in both NMR-related applications and in the environment of a nuclear reactor, high magnetic fields are present. Therefore, it is crucial to study the interactions of spins in the presence of magnetic fields. The first part of this thesis is dedicated to the theoretical study of depolarization of H, H2, and HD in the presence of magnetic fields. In the second part we introduce a versatile method for measuring atomic polarization via the detection of macroscopic magnetization, which can be applied to high density samples (>10 17 cm-3) in contrast to optical methods, which are efficient only for lower density samples (<10 13 cm -3).
Language English
Subject High density
Hiperfine interaction
Υπερλεπτή αλληλεπίδραση
Issue date 2017-11-22
Collection   School/Department--School of Sciences and Engineering--Department of Physics--Post-graduate theses
  Type of Work--Post-graduate theses
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