Detection and spectroscopy of polyatomic molecules inside a cryogenic buffer gas cell

Bieniewska, Julia

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https://hdl.handle.net/2142/100849 Copy

Description

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

Issue Date

2018-06-21

Keyword(s)

Cold and ultracold molecules

Abstract

We are building a cryogenic source of polyatomic molecules that will be used for tests of fundamental physicsa,b . 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 µm 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 v5 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.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Permalink

http://hdl.handle.net/2142/100849

DOI

10.15278/isms.2018.RG05

Copyright and License Information

Copyright 2018 Julia Bieniewska

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