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Identifier 000425710
Title Molecular dynamics of small systems probed with light and electrons
Alternative Title Μοριακή δυναμική μικρών συστημάτων χρησιμοποιώντας φως και ηλεκτρόνια
Author Αφεντάκη, Αγγελική Δ.
Thesis advisor Σαμαρτζής, Πέτρος
Abstract This Master Thesis contains experiments in which photoelectron circular dichroism (PECD) is studied when a chiral molecule gets ionized by circularly polarized laser radiation. The under-study chiral molecule is fenchone, and the radiation was used in different wavelengths in order to examine the wavelength dependence of this phenomenon. The motivation for this investigation was the extension of the knowledge around chiral molecules and the way they interact with circularly polarized light. This will be next used to detect and separate enantiomers. The thesis is divided in 5 Chapters. Chapter 1 provides a brief introduction of the theory which is necessary for the understanding and the interpretation of the experiments described on the following chapters. Specifically, the reader is introduced to the field of chemical dynamics and a review of the results of former experiments on PECD and several ways that this is probed and analyzed are presented. The second chapter consists of a detailed presentation of the experimental setup used in this work, its individual parts, the ion imaging technique as well as a brief explanation of the main information gained: the speed and angular distribution of the measured particles. In the third part of this thesis, we demonstrate the development of a heated nozzle, the way other groups performed the heating and the method we chose to approach it. All the necessary steps are included as well as the final result. In chapter four, the procedure of editing and analyzing the data with several different programs is described. Each step is explained thoroughly, the way the programs process the data and how a researcher uses them are in addition included. In the last chapter, there's a review on previous work on PECD for the chiral molecule fenchone and afterwards, our results and possible interpretationof them are presented. The experiments were conducted for a wide range of wavelengths and for each one we recorded information for the three polarization states, linear, right and left circular polarization. The two enantiomers of the molecule are studied separately and their results are discussed and compared with theoretical calculations. This contribution paves the way to accomplish a generalized enantiospecific method for every chiral molecule.
Language English
Subject Ion imaging
Απεικόνιση ιόντων
Issue date 2019-11-29
Collection   Faculty/Department--Faculty of Sciences and Engineering--Department of Physics--Post-graduate theses
  Type of Work--Post-graduate theses
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