Trace moisture detection using continuous-wave cavity ring-down spectroscopy

被引：75

作者：

Dudek, JB ^{[1
]}

Tarsa, PB ^{[1
]}

Velasquez, A ^{[1
]}

Wladyslawski, M ^{[1
]}

Rabinowitz, P ^{[1
]}

Lehmann, KK ^{[1
]}

机构：

[1] Princeton Univ, Dept Chem, Princeton, NJ 08544 USA

来源：

ANALYTICAL CHEMISTRY | 2003年 / 75卷 / 17期

关键词：

D O I：

10.1021/ac0343073

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

We have developed an instrument to measure trace concentrations of small hydride species in gases using continuous-wave cavity ring-down spectroscopy with near-infrared diode laser excitation. An rms baseline equivalent absorbance of 9.2 x 10(-11) cm(-1)/rootn is found, where n is the number of ring-down transients. When the 1396.376-nm absorption line of water is used, this corresponds to a noise equivalent moisture concentration in nitrogen gas of 68 pptv/rootn. Water vapor concentration is detected over a range extending from 3 to 1000 ppbv and found to depend linearly on the concentration as determined by a calibrated commercial moisture sensor.

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收藏

页码：4599 / 4605

页数：7

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