Cavity-enhanced absorption: detection of nitrogen dioxide and iodine monoxide using a violet laser diode

被引：49

作者：

Kasyutich, VL ^{[1
]}

Bale, CSE ^{[1
]}

Canosa-Mas, CE ^{[1
]}

Pfrang, C ^{[1
]}

Vaughan, S ^{[1
]}

Wayne, RP ^{[1
]}

机构：

[1] Univ Oxford, Phys & Theoret Chem Lab, Oxford OX1 3QZ, England

来源：

APPLIED PHYSICS B-LASERS AND OPTICS | 2003年 / 76卷 / 06期

关键词：

D O I：

10.1007/s00340-003-1153-3

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We present an application of cavity-enhanced absorption spectroscopy with an off-axis alignment of the cavity formed by two spherical mirrors and with time integration of the cavity-output intensity for detection of nitrogen dioxide (NO2) and iodine monoxide (IO) radicals using a violet laser diode at lambda = 404.278 nm. A noise-equivalent (1sigma = root-mean-square variation of the signal) fractional absorption for one optical pass of 4.5x10(-8) was demonstrated with a mirror reflectivity of similar to0.99925, a cavity length of 0.22 m and a lock-in-amplifier time constant of 3 s. Noise-equivalent detection sensitivities towards nitrogen dioxide of 1.8x10(10) molecule cm(-3) and towards the IO radical of 3.3x10(9) molecule cm(-3) were achieved in flow tubes with an inner diameter of 4 cm for a lock-in-amplifier time constant of 3 s. Alkyl peroxy radicals were detected using chemical titration with excess nitric oxide (RO2 + NO --> RO + NO2). Measurement of oxygen-atom concentrations was accomplished by determining the depletion of NO2 in the reaction NO2 + O --> NO + O-2. Noise-equivalent concentrations of alkyl peroxy radicals and oxygen atoms were 3x10(10) molecule cm(-3) in the discharge-flow-tube experiments.

引用

页码：691 / 697

页数：7

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