Journal
ISOTOPES IN ENVIRONMENTAL AND HEALTH STUDIES
Volume 42, Issue 1, Pages 21-35Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/10256010500502934
Keywords
atmosphere; carbon dioxide; carbon-12; carbon-13; cavity ring-down spectroscopy; infrared diode laser
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Recent measurements of carbon isotopes in carbon dioxide using near-infrared, diode-laser-based cavity ring-down spectroscopy (CRDS) are presented. The CRDS system achieved good precision, often better than 0.2%, for 4% CO2 concentrations, and also achieved 0.15-0.25% precision in a 78 min measurement time with cryotrap-based pre-concentration of ambient CO2 concentrations (360 ppmv). These results were obtained with a CRDS system possessing a data rate of 40 ring-downs per second and a loss measurement of 4.0 x 10(-11) cm(-1) Hz(-1/2) . Subsequently, the measurement time has been reduced to under 10 min. This standard of performance would enable a variety of high concentration (3-10%) isotopic measurements, such as medical human breath analysis or animal breath experiments. The extension of this ring-down to the 2 mu m region would enable isotopic analysis at ambient concentrations, which, combined with the small size, robust design, and potential for frequent measurements at a remote site, make CRDS technology attractive for remote atmospheric measurement applications.
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