Pressure broadening and shift coefficients of H2O due to perturbation by N2, O2, H2and He in the 1.39 μm region: experiment and calculations

Zéninari, V.; Parvitte, B.; Courtois, D.; Lavrentieva, N. N.; Ponomarev, Yu. N.; Durry, Georges

doi:10.1080/00268970412331287133

Cited by 43 publications

(22 citation statements)

References 24 publications

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“…For some other lines at close wavenumber ranges, we can find reported values for the comparisons between gas species. 4,15,16) Generally, the broadening coefficients of molecular species are larger than those of rare gases owing to the nature of van der Waals interactions with H 2 O, and the value of CO 2 is larger than that of N 2 . 15) We see that our results are consistent with this tendency.…”

Section: Experimental Results In Dbdsmentioning

confidence: 99%

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Measurements of water molecule density by tunable diode laser absorption spectroscopy in dielectric barrier discharges with gas–water interface

Tachibana

Nakamura

Kawasaki

et al. 2017

Jpn. J. Appl. Phys.

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We measured water molecule (H 2 O) density by tunable diode-laser absorption spectroscopy (TDLAS) for applications in dielectric barrier discharges (DBDs) with a gas-water interface. First, the effects of water temperature and presence of gas flow were tested using a Petri dish filled with water and a gas injection nozzle. Second, the TDLAS system was applied to the measurements of H 2 O density in two types of DBDs; one was a normal (non-inverted) type with a dielectric-covered electrode above a water-filled counter electrode and the other was an inverted type with a water-suspending mesh electrode above a dielectric-covered counter electrode. The H 2 O density in the normal DBD was close to the density estimated from the saturated vapor pressure, whereas the density in the inverted DBD was about half of that in the former type. The difference is attributed to the upward gas flow in the latter type, that pushes the water molecules up towards the gas-water interface.

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Section: Experimental Results In Dbdsmentioning

confidence: 99%

“…Therefore, in this work, we apply tunable diode laser absorption spectroscopy (TDLAS) [3][4][5][6] to the measurement of H 2 O density to study its performance in the practical application of DBDs.…”

Section: Introductionmentioning

confidence: 99%

Measurements of water molecule density by tunable diode laser absorption spectroscopy in dielectric barrier discharges with gas–water interface

Tachibana

Nakamura

Kawasaki

et al. 2017

Jpn. J. Appl. Phys.

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“…The semiempirical method [11] [13][14][15][16][17][18][19][20]. In [13][14][15][16][17][18][19] it has been shown that for polar active molecules the semiempirical approach gives quite accurate parameters values.…”

Section: Methods Of Calculationmentioning

confidence: 99%

Calculations of ozone line shifting induced by N₂and O₂pressure

2009

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Ozone line shifts by nitrogen and oxygen pressure are computed for the 1 þ 3 , 2 1 and 2 3 bands of the 5 m spectral region by a semiempirical approach. The calculated values agree with measurements better than 0.001 cm À1 atm À1 for 98% of O 3 -N 2 lines and 87% of O 3 -O 2 lines. In contrast with the water molecule case, the polarization components of the interaction potential are shown to contribute to the line shift more efficiently than the electrostatic interactions. As intermediate results, the mean dipole polarizability and the components of the polarizability tensor for the vibrational states (101), (200), and (002) of ozone molecule are determined by least-squares fitting of theoretical shifts to some experimental values. The temperature exponents for the 1 þ 3 band lines are also estimated.

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“…For H 2 O, the N 2 -, O 2 -and He-broadening parameters of the considered line at 1368.7 nm were also unknown. These parameters have thus been derived from the values reported for another H 2 O line located at 1393.5 nm [14]. The differences in the air-and self-broadening coefficients between these two lines were about 3% and 4% for the air-and selfbroadening coefficients, respectively.…”

Section: Normalization Of the Pa Signalmentioning

confidence: 99%

Molecular relaxation effects in hydrogen chloride photoacoustic detection

Besson

Schilt²,

Thévenaz

2007

Appl. Phys. B

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A photoacoustic (PA) sensor has been developed to monitor hydrogen chloride at sub-ppm level in the 1740-nm region. The system was designed to control the process in the novel low-water-peak optical fiber manufacturing process. Relaxation effects in hydrogen chloride PA detection in oxygenhelium and nitrogen-helium gas mixtures are presented, showing that the generation of the PA signal is strongly affected by the ratio of these substances. In addition, the role of water vapor in the PA signal is investigated. Photoacoustic spectroscopy (PAS) is a widely recognized technique for its high performance in the detection of trace gases in various applications [1][2][3]. The main advantages of this technique are its intrinsically zero background nature and its achromaticity, which result in a very sensitive and simple setup arrangement suitable in a broad spectral region ranging from the ultraviolet to the mid infrared.The development of photoacoustic (PA) sensors operating in the near-infrared (NIR) range has strongly increased in recent years due to the excellent properties of the available diode lasers. Such laser sources provide single-mode emission (for instance distributed feedback (DFB) lasers) with narrow line width (typically a few MHz), an output power ranging from a few mW to several tens of mW, modulation capabilities and thousands of hours of operation. Moreover, their compact size and their fiber-coupled output make them easy to align with the PA cell.Despite its above-mentioned advantages, PAS is an indirect method since the optical energy absorbed by the molecules is detected through an acoustic wave generated in the gas due to thermal expansion resulting from the vibrationto-translation (V-T) relaxation of the excited molecules. Consequently, the conversion from optical to thermal energy depends on the physico-thermal properties of the gas, so that a calibration of the sensor is required. Whereas molecular re-

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Pressure broadening and shift coefficients of H₂O due to perturbation by N₂, O₂, H₂and He in the 1.39 μm region: experiment and calculations

Cited by 43 publications

References 24 publications

Measurements of water molecule density by tunable diode laser absorption spectroscopy in dielectric barrier discharges with gas–water interface

Measurements of water molecule density by tunable diode laser absorption spectroscopy in dielectric barrier discharges with gas–water interface

Calculations of ozone line shifting induced by N₂and O₂pressure

Molecular relaxation effects in hydrogen chloride photoacoustic detection

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Pressure broadening and shift coefficients of H2O due to perturbation by N2, O2, H2and He in the 1.39 μm region: experiment and calculations

Cited by 43 publications

References 24 publications

Measurements of water molecule density by tunable diode laser absorption spectroscopy in dielectric barrier discharges with gas–water interface

Measurements of water molecule density by tunable diode laser absorption spectroscopy in dielectric barrier discharges with gas–water interface

Calculations of ozone line shifting induced by N2and O2pressure

Molecular relaxation effects in hydrogen chloride photoacoustic detection

Contact Info

Product

Resources

About

Pressure broadening and shift coefficients of H₂O due to perturbation by N₂, O₂, H₂and He in the 1.39 μm region: experiment and calculations

Calculations of ozone line shifting induced by N₂and O₂pressure