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Isotope(18)O/O-16 ratio measurements of water vapor by use of photoacoustic spectroscopy

机译：利用光声光谱法测量水蒸气的同位素（18）O / O-16比

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We applied a photoacoustic spectroscopy technique to isotope ratio measurements of O-16 and O-18 in water-vapor samples, using a pulsed tunable dye laser pumped by a Nd:YAG laser. The fourth overtone bands (4 nu(OH)) of water molecules near 720 nm were investigated. We identified the absorption lines of H-2 O-16 and H-2 O-18 in the photoacoustic spectra that we measured by using an O-18-enriched water sample and the HITRAN database. We measured the difference in the O-18/O-16 isotope ratios for normal distilled water and Antarctic ice, using the photoacoustic method. The value obtained for the difference between the two samples is delta(18)O = -32 +/- 160 parts per thousand, where the indicated deviation was a 1 sigma value among 240-s measurements, whereas the value measured with a conventional isotope mass spectrometer was delta(18)O = -28 +/- 2 parts per thousand. This method is demonstrated to have the potential of a transportable system for in situ and quick measurements of the H-2 O-18/H-2 O-16 ratio in the environment. (C) 1998 Optical Society of America. [References: 18]
机译：我们使用了由Nd：YAG激光泵浦的脉冲可调染料激光，将光声光谱技术应用于水蒸气样品中O-16和O-18的同位素比测量。研究了水分子在720 nm附近的第四泛音带（4 nu（OH））。我们通过使用富含O-18的水样品和HITRAN数据库测量了光声光谱，确定了H-2 O-16和H-2 O-18的吸收线。我们使用光声法测量了正常蒸馏水和南极冰的O-18 / O-16同位素比率的差异。获得的两个样品之间的差异值是delta（18）O = -32 +/- 160千分之千，其中指示偏差为240秒测量值中的1 sigma值，而常规同位素测量的值质谱仪的δ（18）O = -28 +/- 2千分之几。事实证明，该方法具有可现场运输和快速测量环境中H-2 O-18 / H-2 O-16比的潜力。 （C）1998年美国眼镜学会。 [参考：18]

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