Cavity-ring-down spectroscopic studies of NO2 in the region around 613 nm

Lauterbach, Jörg; Kleine, D.; Kleinermanns, Karl; Hering, P.

doi:10.1007/s003400000452

Cited by 10 publications

(12 citation statements)

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“…By use of pulsed CRDS we studied the possible degradation and condensation processes on the cavity mirrors. 10,11 We found that condensation processes can be avoided by heating the mirrors and showed that reactive gases do not damage the cavity mirrors. Additionally, we reached a dynamic range of about three decades in CRDS experiments.…”

Section: Results With Pulsed Crds In the Uvmentioning

confidence: 90%

“…It is apparent from Fig. 4 that CRDS can be used for long-time measurements and has a rapid response time for changes in absorption (see also the NO 2 measurements in ref 11). Figure 4 shows a Cl 2 decay curve measured under atmospheric conditions in a steel cavity.…”

Section: Results With Pulsed Crds In the Uvmentioning

confidence: 99%

“…Additionally, we reached a dynamic range of about three decades in CRDS experiments. 11 But the main question is whether the sensitivity is sufficient for trace gas analysis in ambient air. Employing mirrors with a reflectivity of 99.7% in the UV spectral region, the noise equivalent absorption value obtained by us is 4·10 -7 cm -1 .…”

Section: Results With Pulsed Crds In the Uvmentioning

confidence: 99%

“…In order to detect both isotopomers without cross sensitivity, we had to use a tunable laser system. The light of a CO overtone laser was mixed with an electrooptical modulator which produces tunable microwave side bands (8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18). In this way, we reach a spectral covering of about 14% in the wavelength range between 2.6 and 4 µm.…”

Section: Results With Calos In the Mirmentioning

confidence: 99%

“…Until now, CRDS has been used for various spectroscopic investigations. For example, trace gas analysis, [4][5][6] overtone spectroscopy, 7-10 monitoring of chemical and physical processes, 11,12 condensed phase spectroscopy, 13,14 isotopomeric selective measurements, 15,16 and spectroscopy in molecular jets. 17 Figure 1 shows the schematic setup of a cavity ringdown experiment.…”

Section: Introductionmentioning

confidence: 99%

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Atmospheric trace gas analysis with cavity ring‐down spectroscopy

Kleine

Mürtz

Lauterbach

et al. 2001

Israel Journal of Chemistry

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Cavity ring‐down spectroscopy (CRDS) is a highly sensitive laser absorption method. It can be used for quantitative analysis of molecular species at the sub‐ppb level. The absorption cell (cavity) is sealed by two high‐reflective mirrors on each side, which results in an effective absorption path‐length of some kilometers. Our experiments for atmospheric gas analysis have been carried out so far with an Excimer pumped dye laser in the UV‐VIS and a CO overtone sideband laser in the wavelength region around 3 μm. Experiments with an all solid‐state difference frequency laser system will follow. In the UV‐VIS region, we measured trace gas molecules like SO2, NO2, and CH2O. In the mid‐infrared, around 3 μm, we measured hydrocarbons like CH4, C2H6, and C2H4 with a detection limit of less than 1 ppb. The noise equivalent absorption coefficients in the MIR are in the order of 1.7·10−9 cm−1. Due to the high data acquisition rate and the high sensitivity, CRDS enables real‐time detection of trace gases in ambient air.

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Section: Results With Pulsed Crds In the Uvmentioning

confidence: 90%

Section: Results With Pulsed Crds In the Uvmentioning

confidence: 99%

Section: Results With Pulsed Crds In the Uvmentioning

confidence: 99%