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Spectroscopie à très haute résolution de molécules sublimées en jet supersonique : vers une observation de la non conservation de la parité dans les molécules chirales par spectroscopie laser

Abstract : The work presented in this manuscript consisted in the elaboration and optimisation of an experimental set up dedicated to the observation of parity violation (PV) in a supersonic beam of chiral molecules. Remarkably enough, the molecules considered which are currently being synthesized are in the solid phase at 300 K. We thus built a set up which enables to obtain a vapour phase of the molecules of interest by heating to realise a supersonic expansion via a pickup method with helium as a carrier gas. Furthermore, we used a time of flight technique to detect and estimate the amount of seeded molecules. We tested our set up with methyltrioxorhenium (MTO), a molecule from which chiral derivatives are being synthesized. We built up an experimental procedure to obtain the spectral characteristics and molecular parameters of the studied molecule. For that purpose we used saturated absorption spectroscopy in a cell at 300 K. Then a supersonic expansion of MTO in helium was obtained showing very good results. Indeed a ~10% molar fraction of MTO could be reached. Finally we recorded linear absorption spectra of MTO in beam on the experimental set up dedicated to the PV observation using a multi pass cell. The experimental data analysis enabled to simulate the theoretical spectrum of MTO. These results are very promising results with respect to the future experiments planned with chiral molecules.
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Submitted on : Friday, December 2, 2011 - 11:21:06 AM
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Clara Stoeffler. Spectroscopie à très haute résolution de molécules sublimées en jet supersonique : vers une observation de la non conservation de la parité dans les molécules chirales par spectroscopie laser. Optique [physics.optics]. Université Paris-Nord - Paris XIII, 2011. Français. ⟨tel-00647517⟩

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