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Identifier 000441158
Title Cavity-enhanced atomic Iodine spectroscopy: towards PNC optical rotation measurements
Alternative Title Ενισχυμένη φασματοσκοπία ατομικού ιωδίου εντός οπτικής κοιλότητας: με στόχο την μέτρηση περιστροφής λόγω παραβίασης της συμμετρίας ομοτιμίας
Author Τουτουδάκη, Ειρήνη Ν.
Thesis advisor Ρακιτζής, Πέτρος
Abstract This work presents a cavity-enhanced scheme for the measurement of the atomic iodine spectrum, comprising a four-mirror bow-tie cavity, which increases the effective interaction pathlength of iodine atoms with light, by a factor – essentially – equal to the average number of intracavity photon round-trips. It also doubles as the first steps towards a new type of atomic parity non-conservation (PNC) experiment. In 1959, Zel’dovich first considered the possibility of measuring PNC in atomic transitions, and suggested that if a parity violating weak neutral-current interaction between the electron and the nucleus exists, then the interference with a parity conserving electromagnetic interaction between the electron and the nucleus would make the atomic system optically active. So, the ability to perform measurements of circular birefringence with high sensitivity would constitute a way to measure PNC in a low-energy, atomic physics experiment. The Standard Model, predicts a weak parity non-conserving transition amplitude E1PNC between states of the same parity in certain atomic and molecular systems. Measurement of the E1PNC transition amplitude is possible through the interference with the amplitude of a parity allowed transition. In the vicinity of a parity-allowed magnetic-dipole M1 transition, the interference M1-E1PNC leads to natural optical activity. As a PNC candidate, iodine offers a number of advantages: a high atomic number, Z, which enhances the PNC effect, a strong M1 transition with which the PNC amplitude can interfere, readily available means to create significant atomic populations, even at room temperature, a large number of isotopes, where combined measurements can eliminate deficiencies in our theoretical understanding of atomic iodine, the ability to directly compare results with the bestto-date atomic PNC experiment, that on cesium performed by the C.E. Wieman group in the late 1990s, and more. The main aim of this thesis is to study the iodine magnetic-dipole, M1, transition 52P1/2 → 52P3/2 at 1315 nm, and to measure, for the first time, the electric quadrupole E2 component between the same states, which is expected to provide unambiguous information about a specific component of the PNC interaction, that owing to the elusive anapole moment of the nucleus. The cavity enhancement outlined above is expected to allow for the study of very small signals, such as PNC optical rotation. As a further means of enhancement, we also study the effects of increased temperature for the production of higher atomic iodine column densities, in order to maximize the PNC signal.
Language English, Greek
Issue date 2021-07-28
Collection   School/Department--School of Sciences and Engineering--Department of Physics--Post-graduate theses
  Type of Work--Post-graduate theses
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