Isotope analysis of water by means of near infrared dual-wavelength diode laser spectroscopy

L. Gianfrani, G. Gagliardi, M. van Burgel, Erik Kerstel
2003 Optics Express  
A novel diode laser spectrometer was developed using dualwavelength multiplexing, ensuring ideal conditions for high-precision and simultaneous measurements of the 2 H/ 1 H, 17 O/ 16 O, and 18 O/ 16 O isotope ratios in water. A 1.4-µm diode laser probed a H 16 OH / HO 2 H line pair near 7198 cm -1 , while a similar laser observed H 16 OH, H 17 OH, and H 18 OH rovibrational lines around 7183 cm -1 , or a H 16 OH / H 18 OH line pair near 7200 cm -1 . The 1-σ standard deviation is 0.2‰ for 18 O/
more » ... O, and 0.5‰ for the 2 H/ 1 H and 17 O/ 16 O isotope ratios. Preliminary experiments with repeated injections of a natural abundance sample point to an accuracy of about 1‰ for all three isotope ratios in natural samples.
doi:10.1364/oe.11.001566 pmid:19466032 fatcat:titerxepszcelpwp2ekielsuy4