13CO2/12CO2 isotopic ratio measurements using a difference frequency-based sensor operating at 4.35 micrometers |
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| Authors: | Erdelyi M Richter D Tittel F K |
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| Institution: | (1) Rice Quantum Institute, Rice University, 6100 Main Street, Houston, TX 77005, USA, US;(2) National Center for Atmospheric Research, 1850 Table Mesa Dr., Boulder, CO 80305, USA, US |
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| Abstract: | A portable modular gas sensor for measuring the 13C/12C isotopic ratio in CO2 with a precision of 0.8‰(±1σ) was developed for volcanic gas emission studies. This sensor employed a difference frequency generation (DFG)-based spectroscopic
source operating at 4.35 μm (∼2300 cm-1) in combination with a dual-chamber gas absorption cell. Direct absorption spectroscopy using this specially designed cell
permitted rapid comparisons of isotopic ratios of a gas sample and a reference standard for appropriately selected CO2 absorption lines. Special attention was given to minimizing undesirable precision degrading effects, in particular temperature
and pressure fluctuations.
Received: 16 April 2002 / Revised version: 28 May 2002 / Published online: 21 August 2002
RID="*"
ID="*"Corresponding author. Fax: +1-713/5245237, E-mail: fkt@rice.edu |
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| Keywords: | PACS: 42 60 By 42 62 -b 42 62 Fi 42 65 Ky |
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