Abstract
For high sensitivity measurements of isotope concentration - ratios of trace-level gas mixtures, particularly including carbon dioxide isotopes, we tested a 12 CO2 - 13 CO2 composite laser system containing intracavity absorption-ells. Sensitivity enhancement obtainable by the intracavity modulation absorption-cell with synchronous detection scheme was examined theoretically. 13CO2 in atmospheric air was readily detected and minimum detectable concentration by the present system was estimated to be 70 ppb.
© 2001 IEEE
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