Accurate comb-assisted cavity ring down spectroscopy of molecular hydrogen

Kassi, Samir

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https://hdl.handle.net/2142/100450 Copy

Description

Title

Accurate comb-assisted cavity ring down spectroscopy of molecular hydrogen

Author(s)

Kassi, Samir

Contributor(s)

• Campargue, Alain
• Konefal, Magdalena
• Stoltmann, Tim

Issue Date

2018-06-18

Keyword(s)

Mini-symposium: Frequency-Comb Spectroscopy

Abstract

Because molecular hydrogen is the simplest molecule, it is considered as the best candidate for a direct comparison of experiment against high level ab initio calculations, both in terms of transition frequencies and line strength. Unfortunately, this apparent simplicity is not only spoiled by the weakness of the transition, but also by its surprisingly complex line profile that hampers accurate parameters to be straightforwardly derived. To address that problem, we have recorded with unprecedented sensitivity pure H2 Q(1) 2-0 and D2 S(2) 2-0 transitions around 1.24 and 1.59 µm, respectively, down to a pressure of 100 Pa. A limit of detection of about 2×10−12 cm−1was achieved with the two accurate comb-referenced cavity ring down spectrometers used. Effective parameters were determined for different line profiles (NGP, SDNGP, HTP), allowing line reproduction down to the noise level. The zero pressure parameters will be presented and discussed.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Permalink

http://hdl.handle.net/2142/100450

DOI

10.15278/isms.2018.MG07

Copyright and License Information

Copyright 2018 Samir Kassi

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