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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
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Καννής, Χρυσοβαλάντης Σ.
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Thesis advisor
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Ρακιτζής Πέτρος-Θεόδωρος
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Reviewer
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Χαραλαμπίδης, Δημήτρης
von Klitzing, Wolf
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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).
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Language |
English |
Subject |
High density |
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Hiperfine interaction |
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Magnetization |
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Polarization |
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Μαγνήτιση |
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Πόλωση |
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Υπερλεπτή αλληλεπίδραση |
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Υψηλή |
Issue date |
2017-11-22 |
Collection
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School/Department--School of Sciences and Engineering--Department of Physics--Post-graduate theses
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Type of Work--Post-graduate theses
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Permanent Link |
https://elocus.lib.uoc.gr//dlib/1/5/7/metadata-dlib-1509011305-579752-15448.tkl
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Views |
620 |