E-Locus - Ιδρυματικό Καταθετήριο Πανεπιστημίου Κρήτης - Measurement of M1 and E2 components of the atomic iodine transition at 1315 nm using cavity-enhanced absorption spectroscopy

Αρχική Measurement of M1 and E2 components of the atomic iodine transition at 1315 nm using cavity-enhanced absorption spectroscopy

Αποτελέσματα - Λεπτομέρειες

[Προσθήκη στο καλάθι]

Τίτλος

Measurement of M1 and E2 components of the atomic iodine transition at 1315 nm using cavity-enhanced absorption spectroscopy

Άλλος τίτλος

Μέτρηση των συνιστωσών Μ1 και Ε2 της μετάβασης ατομικού ιωδίου στα 1315 nm μέσω φασματοσκοπίας απορρόφησης εντός οπτικής κοιλότητας

Συγγραφέας

Σαργιάννη, Ζωή

Σύμβουλος διατριβής

Ρακιτζής, Πέτρος

Περίληψη

The aim of this thesis is the study of the 5²𝑃_3/2 → 5 ²𝑃_1/2 magnetic dipole (M1) transition of atomic iodine, ¹²⁷I, at 1315nm using an optical-cavity-enhanced absorption scheme. Combining high atomic iodine densities, produced via high-power photodissociation of molecular iodine at 532nm, and long interaction pathlengths, due to the high-finesse optical cavity setup, we produced high atomic iodine column densities, which enabled the measurement of the electric quadrupole (E2) component of the transition of interest. These quadrupole component measurements performed in our lab are the only such measurements to the best of our knowledge. The dimensionless ratio of E2 to M1 matrix elements was found to be 𝜒 = 𝐸2/𝑀1 = [𝟎. 𝟎𝟖𝟓 ± 𝟎. 𝟎𝟎𝟒], with 𝑀1 = 1.15𝜇_𝐵 = 0.0042𝑒𝛼_𝐵. Regarding the structure of this thesis, in the first part we describe the required theory: gaussian beams, optical cavities, then the theory of atomic transitions, both from the side of the effect of matter on light (Maxwell equations, atomic medium polarization, index of refraction), as well as from the side of the effect of light on matter (transition rates, absorption and stimulated emission of radiation, cross-sections, multipole expansion of the electric field and allowed/forbidden transitions, and selection rules). Then, the specific theory of the relevant M1 transition of iodine and a brief discussion of the photodissociation process of molecular iodine into atomic are given. In the second part of the thesis, we present the experimental scheme, we describe the measurement process, and finish with the analysis of the results and our conclusions.

Γλώσσα

Αγγλικά

Ημερομηνία έκδοσης

2022-07-22

Συλλογή

Σχολή/Τμήμα--Σχολή Θετικών και Τεχνολογικών Επιστημών--Τμήμα Φυσικής--Πτυχιακές εργασίες

Τύπος Εργασίας--Πτυχιακές εργασίες

Εμφανίσεις

207

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