New approaches for stable isotope ratio measurements
نویسنده
چکیده
We demonstrate the first successful application of infrared laser spectrometry to the accurate, simultaneous determination of the relative H/H, O/O, and O/O isotope abundance ratios in natural water. The method uses a narrow line width color center laser to record the direct absorption spectrum of low-pressure gas-phase water samples (presently 10 μl liquid) in the 3 μm spectral region. The precision of the spectroscopic technique is shown to be 0.7‰ for H and 0.5‰ for O and O, while the calibrated accuracy for natural waters amounts to about 3‰ and 1‰, respectively.
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