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Tunable diode laser spectrometer for isotope ratio measurements

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Abstract

Determining the isotope ratio of (18O/16O) in environmental N2O by ratio mass spectrometry is difficult because of interference from CO2. Such measurements would be of value in tracing the pathways of N2O in the environment, a subject of current interest.1,2 for the analysis to be useful, variations of the order of δ18O = 1.0%0 must be measurable, where δ18O(%0)= {(18O/16O)sample(18O/16O)reference]/(18O/16O)reference }× 1000. Tunable diode laser (TDL) spectroscopy has been suggested3 as a possible analytical technique, in this method the laser is tuned over two adjacent but well-resolved vibration-rotation absorption lines, one of each isotopic species, while monitoring the transmitted light with a defector.

© 1983 Optical Society of America

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