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Frankfurt 2006 – wissenschaftliches Programm

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Q: Quantenoptik und Photonik

Q 66: Laser in der Medizin und Umweltmeßtechnik

Q 66.4: Vortrag

Donnerstag, 16. März 2006, 15:45–16:00, HII

Rapidly Swept CW Cavity Ring-down Laser Spectroscopy for Carbon Isotope Analysis — •Hideki TOMITA1,2, Yu TAKIGUCHI1, Kenichi WATANABE1, Jun KAWARABAYASHI1, and Tetsuo IGUCHI11Dept. of Quantum Eng., Nagoya Univ., Nagoya, 464-8603, Japan — 2Institute of Physics, Johannes Gutenberg Univ., Mainz, D-55128, Germany

Ultra trace detection of stable or long lived carbon isotope tracers is widely used in many fields of research. Particularly, in-field measurements of carbon isotope ratios are required for environmental studies, e.g. on the ground-level carbon cycle in forests and volcanic gas emission. With the aim of developing a portable system for in-field isotope analysis, we investigate isotope analysis based on Rapidly Swept CW Cavity Ring-Down Laser Spectroscopy [1]. Basic performance of this system for 13C/12C isotope analysis was measured in overtone absorption lines of 12C16O2 and 13C16O2 using a near-IR (1.6 µm) DFB diode laser. The obtained isotopic ratio showed good agreement with the natural abundance within experimental uncertainty. The detectable concentration for 13C16O2 was determined from the standard deviation of the measured ring-down rate to be 900 ppmv. Considering possible technical improvements, we estimate that a minimum detectable concentration of 0.3 ppmv would be achievable by using a diode laser at 2 µm. Thus, this system has a large potential for in-field 13C/12C and potentially also 14C/12C isotope analysis.

[1] Y. He and B.J. Orr, Chem. Phys. Lett. 319, 131 (2000).

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