Off-axis cavity ringdown spectroscopy: application to atmospheric nitrate radical detection

被引：47

作者：

Ayers, JD ^{[1
]}

Apodaca, RL

Simpson, WR

Baer, DS

机构：

[1] Univ Alaska Fairbanks, Inst Geophys, Fairbanks, AK 99775 USA

[2] Univ Alaska Fairbanks, Dept Chem & Biochem, Fairbanks, AK 99775 USA

[3] Los Gatos Res, Mountain View, CA 94041 USA

来源：

APPLIED OPTICS | 2005年 / 44卷 / 33期

关键词：

D O I：

10.1364/AO.44.007239

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Atmospheric nitrate radicals (NO3) are detected using off-axis cavity ringdown spectroscopy (CRDS) for the first time to our knowledge with a room-temperature continuous-wave (cw) diode laser operating near 662 nm. A prototype instrument was constructed that achieved a la absorption sensitivity of 5 X 10(-10) cm(-1) Hz(-1/2), corresponding to a 1.4 part per trillion by volume 2 sigma detection limit in 4.6 s at 80 degrees C. This sensitivity is a significant improvement over a recent implementation of off-axis cavity-enhanced absorption spectroscopy and comparable to that of the most advanced cw CRDS and pulsed CRDS applications for atmospheric detection of NO3. A comparison of measurements of ambient air in Fairbanks, Alaska, recorded with the off-axis CRDS instrument and a previously characterized conventional cw CRDS instrument showed good agreement (R-2 = 0.97). (c) 2005 Optical Society of America.

引用

页码：7239 / 7242

页数：4

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