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Identifier 000460273
Title Measurement of weak optical rotation from chiral organic vapors via cavity enhanced polarization spectroscopy
Alternative Title Μέτρηση της ασθενούς οπτικής περιστροφής χειρόμορφων οργανικών αερίων με χρήση ενισχυμένης φασματοσκοπίας πόλωσης μέσω οπτικής κοιλότητας
Author Λιναράκη, Άρτεμις Ν.
Thesis advisor Ρακιτζής, Πέτρος
Reviewer Χαραλαμπίδης, Δημήτρης
Μακρής, Κωνσταντίνος
Abstract The main purpose of this thesis was the development of an optical-cavity-enhanced polarimetric instrument and its employment to measuring various chiral organic vapors causing particularly weak optical rotations with unprecedented sensitivity. More specifically, we focused on (+)-α-pinene, methyl lactate and ethyl-1-d-benzene. Pinene is a terpene compound found in the oils of many coniferous trees, especially pines, and (+)-α-pinene is one of its enantiomers. Methyl lactate is another organic compound, the methyl ester of lactic acid. It is naturally derived and can be obtained as a single enantiomer. Ethyl-1-d-benzene breaks reflection symmetry only due to the interchange of H and D nuclei, so that the optical activity is the result of the breakdown of the Born-Oppenheimer approximation, making it extremely weak, with an expected specific rotation of about 0.1-1 deg cm3 dm-1 gr-1. In contrast, (+)-α-pinene and methyl lactate have an expected specific rotation of a few tens of deg c cm3 dm-1 gr-1 and a few deg cm3 dm-1 gr-1respectively. The measurements presented here were based on a Cavity Ring-Down scheme, employing two signal reversals, allowing us to obtain results for the absolute optical rotation of the aforementioned gaseous samples. We acquired measurements with a sensitivity of ~6 μdeg/√Hz, while state-of-the-art commercial polarimeters can only achieve sensitivities of ~5 mdeg/√Hz. This improved sensitivity opens the way for new applications of chiral polarimetry, such as the detection of chiral thin films.
Language English
Subject Chirality
Laser spectroscopy
Optical cavities
Οπτικές κοιλότητες
Φασματοσκοπία laser
Χειρομορφία
Issue date 2024-03-29
Collection   School/Department--School of Sciences and Engineering--Department of Physics--Post-graduate theses
  Type of Work--Post-graduate theses
Permanent Link https://elocus.lib.uoc.gr//dlib/1/c/1/metadata-dlib-1699435979-949255-16704.tkl Bookmark and Share
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