2005
DOI: 10.1080/10256010500384408
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Time resolved simultaneous detection of14NO and15NO via mid-infrared cavity leak-out spectroscopy

Abstract: We present a ring-down absorption spectrometer based on a continuous-wave CO laser in the mid-infrared spectral region near lambda = 5 microm. Using a linear ring-down cavity (length: 0.5 m) with high reflective mirrors (R = 99.988 %), we observed a noise-equivalent absorption coefficient of 3 x 10(-10) cm(-1)Hz(-1/2). This corresponds to a noise-equivalent concentration of 800 parts per trillion (ppt) for (14)NO and 40 ppt for (15)NO in 1 s averaging time. We achieve a time resolution of 1 s which allows time… Show more

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Cited by 25 publications
(33 citation statements)
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“…Long path length multiple-pass cells can be rather susceptible to sinusoidal modulations of the spectrum baseline (fringes), induced by partial overlap of beam paths inside the cell. High finesse optical cavity based techniques too can suffer from unwanted reflections in the optical system, similarly leading to optical fringes, as well a a Note that the mixing ratios used in these two studies ( [86] and [87]) are a factor of, respectively, ∼ 2600 and ∼ 550 higher than natural.…”
Section: Discussionmentioning
confidence: 99%
“…Long path length multiple-pass cells can be rather susceptible to sinusoidal modulations of the spectrum baseline (fringes), induced by partial overlap of beam paths inside the cell. High finesse optical cavity based techniques too can suffer from unwanted reflections in the optical system, similarly leading to optical fringes, as well a a Note that the mixing ratios used in these two studies ( [86] and [87]) are a factor of, respectively, ∼ 2600 and ∼ 550 higher than natural.…”
Section: Discussionmentioning
confidence: 99%
“…We recently reported the technical details of this spectroscopic setup. 8,9 The noise-equivalent CO concentration was 7 ppb with a subsecond time resolution. For calibration, a certified gas mixture of 3.45 ppm CO in nitrogen was used.…”
Section: Laser-spectroscopic Eco Measurementsmentioning
confidence: 99%
“…Modifications of the original approach include the use of cw radiation instead of pulsed radiation injected into the external cavity, then often called cavity leak-out spectroscopy (CA-LOS) [32] or an arrangement known as off-axis integrated cavity output spectroscopy (ICOS) [33]. These techniques are based on an external cavity with highly reflecting mirrors with a reflectivity of ≥ 99.99%.…”
Section: Detection Schemesmentioning
confidence: 99%