Abstract

A mid-infrared laser spectrometer was developed for simultaneous high-precision O18O16 and O17O16 isotope ratio measurements in carbon dioxide. A continuous-wave, liquid-nitrogen cooled, distributed feedback quantum cascade laser, working at a wavelength of 4.3μm, was used to probe C12O216, O16C12O18, and O16C12O17 lines at 2311.8cm1. High sensitivity was achieved by means of wavelength modulation spectroscopy with second-harmonic detection. The experimental reproducibility in the short and long terms was deeply investigated through the accurate analysis of a large number of spectra. In particular, we found a short term precision of 0.5 and 0.6, respectively, for O18O16 and O17O16 isotope ratios. The occurrence of systematic deviations is also discussed.

© 2007 Optical Society of America

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