Abstract

A spectrometer was used in the laboratory to study water-vapor isotope ratio measurements in air: H2O18H2O16 and HDOH2O16 near 6.7μm. The spectral region ranging from 1483 to 1487cm1, which is suitable for the in situ laser sensing of major water-vapor isotopologues in the middle atmosphere from airborne or balloonborne platforms, was investigated by use of a continuous-wave distributed feedback quantum-cascade laser. The concentrations obtained were compared with the concentrations obtained with a hygrometer. The δ(O18) values were found to be in excellent agreement with the standard value for two individual lines. The δ(D) value was slightly higher than the standard value.

© 2006 Optical Society of America

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