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Title:DETECTION AND SPECTROSCOPY OF POLYATOMIC MOLECULES INSIDE A CRYOGENIC BUFFER GAS CELL
Author(s):Bieniewska, Julia
Contributor(s):Sears, Trevor; Darquie, Benoit; Tarbutt, Michael; Sauer, B. E.; Wall, Thomas
Subject(s):Cold and ultracold molecules
Abstract:\noindent We are building a cryogenic source of polyatomic molecules that will be used for tests of fundamental physics\footnote{B. Darqui\'e \emph{et al.}, Chirality \textbf{22}, 870-884 (2010)}$^,$\footnote{S.K. Tokunaga \emph{et al.} New Journal of Physics \textbf{19}, 053006 (2017)}. The molecules are cooled by a buffer gas of 4 K He inside a copper cell mounted on the cold stage of a cryo-cooler. For the development of this source we are using 1,3,5-trioxane. Although a solid at room temperature, it has a high vapour pressure. We inject this vapour into the buffer gas cell through a room temperature tube. We probe the cooled molecules inside the cell using wavelength modulation (WM) spectroscopy, driving vibration-rotation transitions using $10.2~\mu$m wavelength radiation from a quantum cascade laser. I will present data from recent experiments in which we performed WM spectroscopy close to the Q-branch origin of the \textit{v}$_5$ vibrational fundamental band. We use these spectra to probe the temperature and density of the molecules inside the cell. Most recently we have performed sub-Doppler spectroscopy, recording Lamb dips that can be used to study collision rates inside the cell. I will discuss our plans to perform sensitive detection of a slow, cold beam of trioxane produced by this source, including a multi-pass optical assembly and cavity enhanced absorption spectroscopy.
Issue Date:06/21/18
Publisher:International Symposium on Molecular Spectroscopy
Citation Info:APS
Genre:Conference Paper / Presentation
Type:Text
Language:English
URI:http://hdl.handle.net/2142/100849
DOI:10.15278/isms.2018.RG05
Other Identifier(s):RG05
Date Available in IDEALS:2018-08-17
2018-12-12


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