High sensitivity CW-cavity ring down spectroscopy of water in the region of the 1.5μm atmospheric window

Macko, Peter; Romanini, D.; Михайленко, С.Н.; Naumenko, O. V.; Kassi, S.; Jenouvrier, A.; Tyuterev, Vladimir G.; Campargue, A.

doi:10.1016/j.jms.2004.05.020

Cited by 150 publications

(132 citation statements)

References 58 publications

(135 reference statements)

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“…The residual concentration, which is not due to some prior sample in the cell, has been evaluated from [35] to be about 2.5 Â 10 À4 % of the total sample pressure. Note that these NH 3 lines have also been observed elsewhere in an earlier work [21].…”

supporting

confidence: 82%

“…Among them, 9494 observed lines could be assigned (10,161 assigned transitions, taking into account an overlapping of some of the resulting lines) to the 4 major isotopic water species. A statistic of the lines is given in Table 2 where the number of assignments is compared to the most complete observations in this region [19,21,22] and to the HITRAN database [35]. It is seen that a progress compared to HITRAN has been mainly achieved for H 2 16 O and HDO.…”

Section: Line Identifications Positions and Assignmentsmentioning

confidence: 99%

“…Very little information is given in the literature on the NH 3 line positions and strengths. Assignments of the most intense lines have been made from [35] in the spectral region up to 5300 cm À1 and from [21,39] in the spectral region above 6130 cm À1 . The residual concentration, which is not due to some prior sample in the cell, has been evaluated from [35] to be about 2.5 Â 10 À4 % of the total sample pressure.…”

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confidence: 99%

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Fourier transform measurements of water vapor line parameters in the 4200–6600cm−1 region

Jenouvrier

Daumont

Régalia-Jarlot

et al. 2007

Journal of Quantitative Spectroscopy and Radiative Transfer

126

115

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New high-resolution water vapor absorption spectra were obtained at room temperature in the 4200-6600 cm À1 spectral region by combining Fourier transform spectrometers (FTS) with single and multiple reflection cells. With absorption paths from 0.3 to 1800 m in pure and air diluted water vapor, accurate measurements of about 10400 lines in an intensity range from 10 À29 to 10 À19 cm/molecule have been performed. Positions, intensities, self-and air-broadening coefficients and air-induced shifts were determined for the H 2 16 O, H 2 17 O, H 2 18 O and HDO isotopologues. The rovibrational assignment of the observed lines was performed with the use of global variational predictions and allowed the identification of several new energy levels. One major contribution of this work consists of the identification of 3280 new weak lines. A very close agreement between the new measured parameters and those listed in the database is reported as well as between the observations and the most recent variational calculations for the positions and the intensities. The present parameters provide an extended and homogeneous data set for water vapor, which is shown to significantly improve the databases for atmospheric applications, especially in the transmission windows on both sides of the band centered at 5400 cm À1 .

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supporting

confidence: 82%

Section: Line Identifications Positions and Assignmentsmentioning

confidence: 99%

mentioning

confidence: 99%

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Fourier transform measurements of water vapor line parameters in the 4200–6600cm−1 region

Jenouvrier

Daumont

Régalia-Jarlot

et al. 2007

Journal of Quantitative Spectroscopy and Radiative Transfer

126

115

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“…Each of the 200 experimental data points (solid markers) corresponds to the average of 100 ring-down events. Apart from the C 2 H 2 absorption line, peaks of NH 3 (6565.496 cm -1 and 6565.692 cm -1 [32]), CO 2 (6565.509 cm -1 [30]), hydrogen cyanide (HCN) (6565.532 cm -1 [33]) and heavy water (HDO) (6565.799 cm -1 and 6565.754 cm -1 [28]) were identified in this spectral region. Occasionally, a weak H 2 O line at 6565.501 cm -1 [28] was also observed.…”

Section: Resultsmentioning

confidence: 99%

“…The same type of background signal was also described in Ref. [28], where the authors applied mechanical vibrations to the setup to randomize (and average out) the modulation. In a similar approach, we used a ring-type piezo to apply a slow (2 Hz) sine-wave modulation (of about one FSR) to the front mirror of the cavity.…”

Section: Cavity Ring-down Setupmentioning

confidence: 99%

Direct detection of acetylene in air by continuous wave cavity ring-down spectroscopy

et al. 2010

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Diode laser based continuous wave cavity ring-down spectroscopy (cw-CRDS) in the near-infrared region has been used to measure the mixing ratio of acetylene (C 2 H 2 ) in ambient air. Detection limits of 120 parts per trillion by volume (pptv) for 20 min and 340 pptv for 70 s acquisition time were achieved without sample pre-concentration, measuring on a C 2 H 2 absorption line at 6565.620 cm −1 (∼1523 nm). Several indoor and outdoor air samples were collected at different locations in the Helsinki metropolitan area and analyzed using static-cell measurements. In addition, flow measurements of indoor and outdoor air have been performed continuously over several days with a time resolution of down to one minute. Baseline acetylene levels in the range of 0.4 to 3 parts per billion by volume (ppbv), with a maximum around midday and a minimum during the night, were measured. Sudden high mixing ratios of up to 60 ppbv were observed in outdoor air during daytime on a minute time scale. In general, the indoor mixing ratios were found to be higher than those in outdoor air. The acetylene levels correlated with the ambient CO levels and with outdoor temperature.

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Temperature dependence of the water vapor self‐continuum by cavity ring‐down spectroscopy in the 1.6 µm transparency window

et al. 2014

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The very weak water vapor self-continuum has been investigated by high-sensitivity cavity ring-down spectroscopy in the 1.6 μm window at five temperatures between 302 K and 340 K. The absorption cross sections, C s (ν, T), were retrieved for 10 selected wave numbers from a fit of the absorption coefficients measured in real time during pressure ramps, after subtraction of the contributions of the local water monomer lines and of water adsorbed on the cell mirrors. The values measured between 5875 and 6665 cm À1 range between 1.5 × 10 À25 and 2 × 10 À24 cm 2 mol À1 atm À1 with a minimum around 6300 cm À1 .At 302 K, an agreement within 50% is observed over the whole window with the cross sections provided by the MT_CKD V2.5 model. Nevertheless, while our measurements show that the C s (ν, T) decrease from 302 K to 340 K is no more than 50% for all our selected wave numbers, the MT_CKD V2.5 model predicts a much more pronounced temperature dependence in the center of the window, the agreement being better on the edges of the window. The obtained results are discussed in relation with theoretical modeling of the water vapor self-continuum as far wings of monomer lines or water dimer absorption. For potential atmospheric applications, cross sections are provided at each temperature with a sampling step of 10 cm À1for the entire 5850-6700 cm À1 range.

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High sensitivity CW-cavity ring down spectroscopy of water in the region of the 1.5μm atmospheric window

Cited by 150 publications

References 58 publications

Fourier transform measurements of water vapor line parameters in the 4200–6600cm−1 region

Fourier transform measurements of water vapor line parameters in the 4200–6600cm−1 region

Direct detection of acetylene in air by continuous wave cavity ring-down spectroscopy

Temperature dependence of the water vapor self‐continuum by cavity ring‐down spectroscopy in the 1.6 µm transparency window

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