Optika Atmosfery i Okeana Journal

Vol. 18, issue 10, article # 1

Nadezhdinskii A. I., Grigoriev G. Yu., Malyugin S. L., Makkaveiskii A. V., Nabiev Sh. Sh., Stavrovskii D. B., Ponurovskii Ya. Ya., Shapovalov Yu. P., Babichev A. P. Measurements of the ¹³СО₂/¹²CO₂ content ratio with the use of near IR diode lasers. // Atmospheric and oceanic optics. 2005. V. 18. No. 10. P. 751-755. PDF
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Abstract:

The paper reports on the development of instrumentation for express-measurements of ¹³СО₂ concentration using the СО₂ absorption spectrum in the near-infrared range. The relative error in the d-factor determination in the breath-test obtained from 100 single measurements summed was within 0.7‰. To determine the absolute error of the isotopic ratio measurements, we have conducted independent calibration measurements with five СО₂ samples of different isotope composition using both the diode laser spectroscopy (DLS) and mass-spectrometers.