A Quantum Cascade laser-based water vapor (H<sub>2</sub>16<sup><sub>2</sub></sup>O and H<sub>2</sub><sup>18</sup>O) isotope analyzer for fast, real-time measurement of δ<sup>18</sup>O in the urban environment with 1s accuracy of 0.74 ‰ was developed. The sensor was laboratory tested and the time series of δ<sup>18</sup>O in ambient outdoor air has also been acquired and presented.

© 2013 OSA

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