Dual Wavelength Cavity Ringdown Spectroscopy For High Precision Methane Isotope Ratio Measurements

Bui, Thinh Quoc

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https://hdl.handle.net/2142/51077 Copy

Description

Title

Dual Wavelength Cavity Ringdown Spectroscopy For High Precision Methane Isotope Ratio Measurements

Author(s)

Bui, Thinh Quoc

Contributor(s)

• Okumura, Mitchio
• Chen, Pin
• Hogan, Daniel
• Shen, Linhan

Issue Date

2014-06-17

Keyword(s)

Instrument/Technique Demonstration

Abstract

We demonstrate a frequency stabilized cavity ringdown spectrometer capable of measuring simultaneous isotopes of methane (\chem{^{12}CH_4}, \chem{^{13}CH_4}, \chem{^{12}CH_3D}) of enriched samples to high precision ($\delta$D$\textless$0.03$\%$ and $\delta$13C$\textless$0.01$\%$). The spectrometer employs coupling of two orthogonally polarized CW lasers into a ringdown cavity for simultaneous spectral measurements over the full wavelength range of 1.45-1.65$\mu$m. In addition, we discuss the necessity of modeling methane lineshapes with the Galatry profile to achieve the highest precision.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

English

Permalink

http://hdl.handle.net/2142/51077

DOI

https://doi.org/10.15278/isms.2014.TJ10

Copyright and License Information

Copyright 2014 by the authors. Licensed under a Creative Commons Attribution 4.0 International License. http://creativecommons.org/licenses/by/4.0/

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