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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

Magnetization

Polarization

Μαγνήτιση

Πόλωση

Υπερλεπτή αλληλεπίδραση

Υψηλή

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