Measurements of Pressure Broadening and Shifts of O3 Lines in the 3-μm Region

Smith, Mary Ann H.; Rinsland, C. P.; Devi, V. Malathy; Prochaska, Eleanor S.

doi:10.1006/jmsp.1994.1070

Cited by 13 publications

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“…The fact that shifts are negative and that the effect increases in magnitude with increasing quantum number has already been observed in other bands (Fig. 6) and this is now confirmed for the R-branch of the ν 3 fundamental[8,[12][13][14][15][16][17][18].Fig. 6also implies that the magnitude of the shift increases with vibrational excitation.…”

supporting

confidence: 77%

“…[17]; 3ν 3 : [17]. Fit lines were obtained by direct fit to the data, except for the ν 1 and the ν 1 + ν 3 bands.…”

Section: Discussionmentioning

confidence: 99%

“…At present, all transitions belonging to this band have shift parameters arbitrarily set to δ = −7 • 10 −4 cm -1 / atm in HITRAN [19] or to δ = 0 in GEISA [20] and in S&MPO [21]. Nevertheless, shifting parameters are vibration dependent [22], show a large variability [12][13][14][15][16][17], and the validity of these attributions thus requires experimental verification.…”

Section: Introductionmentioning

confidence: 99%

“…tally [12][13][14][15][16][17] and theoretically [8,18, and references therein] mostly in the ν 1 , ν 2 , ν 1 + ν 3 , ν 1 + ν 2 + ν 3 , and 3ν 3 vibrational bands. For an extensive review of these measurements up to 1998 readers are referred to Ref.…”

mentioning

confidence: 99%

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First pressure shift measurement of ozone molecular lines at 9.54 μm using a tunable quantum cascade laser

Minissale

Zanon-Willette

Jeseck

et al. 2018

Journal of Molecular Spectroscopy

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Using a free-running distributed-feedback quantum cascade laser (QCL) emitting at 9.54 µm, the pressure shift parameters of four intense rovibrational transitions in the ν 3 fundamental band of ozone induced by oxygen (O 2 ), air and the noble gases helium (He), argon (Ar), and xenon (Xe) are obtained by employing second harmonic detection. The experimental analysis comprises a full uncertainty budget and provides line shift data which are traceable to SI. The high density of transitions in the ν 3 spectral region of ozone make this region particularly difficult to study with more commonly used techniques such as Fourier transform spectroscopy. The comparatively high spectral resolution of the QCL in the MHz range, on the contrary, allows to measure molecular shifts at relatively low pressures (from 2 to 70 hPa), thus reducing the impact of spectral congestion due to pressure broadening of molecular lines. The comparison of our results with published data shows that presently recommended values for the pressure shift are too low in this region. This observation is corroborated by semi-classical calculations using the Robert-Bonamy formalism. A slight negative J dependence, already observed in other ozone vibrational bands, is predicted. Systematic use of our technique could be very useful to support this hypothesis and to make up for the lack of shift parameters for ozone ν 3 transitions in molecular spectral databases. A subsequent stabilization of the QCL onto an optical frequency comb will open up possibilities to perform metrological measurements of Doppler-free molecular lines.

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supporting

confidence: 77%

“…[17]; 3ν 3 : [17]. Fit lines were obtained by direct fit to the data, except for the ν 1 and the ν 1 + ν 3 bands.…”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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First pressure shift measurement of ozone molecular lines at 9.54 μm using a tunable quantum cascade laser

Minissale

Zanon-Willette

Jeseck

et al. 2018

Journal of Molecular Spectroscopy

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“…While the ozone line broadening has been quite well studied experimentally and theoretically, the data on its line shifts are very sparse. Besides the already mentioned works [34,35] the previous studies of the same authors [43,44] as well as Refs [45][46][47] should be mentioned for currently available experimental results. No experimental data are published for the purely rotational line shifts of O 3 because of their too small values.…”

Section: Parametermentioning

confidence: 97%

Pressure broadening and shifting of vibrotational lines of atmospheric gases

Buldyreva¹,

Lavrentieva²,

Starikov³

2010

Collisional Line Broadening and Shifting of Atmospheric Gases

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Water vapour is one of the strongest absorbers of radiation in the Earth's atmosphere, but some other gases also play an important role in the atmospheric radiative transfer processes: carbon dioxide CO 2 , carbon monoxide CO, ozone О 3 , methane CH 4 . Minor atmospheric pollutants such as hydrogen sulphide H 2 S, methyl fluoride CH 3 F, methyl chloride CH 3 Cl, ethylene C 2 H 4 , nitric oxide NO, nitrous oxide N 2 O and nitrogen dioxide NO 2 are equally recognised for their implication in the fundamental chemical reactions occurring in the terrestrial atmosphere. As a consequence, a lot of spectroscopic studies are made for these molecules in order to obtain the line positions, intensities and widths. They are briefly summarised below, starting by asymmetric waterlike molecules of X 2 Y-type which have the same selection rules for vibrotational spectra. Vibrotational lines of asymmetric X 2 Y moleculesBetween asymmetric tops of the X 2 Y type most attention in the spectroscopic literature is paid to the H 2 S, SO 2 , O 3 and NO 2 molecules. _________________________________________________________________ A vibrotational state (v 1 v 2 v 3 ) [J K a K c ] of these molecules is characterised by three vibrational quantum numbers v 1 , v 2 , v 3 and three rotational quantum numbers J, K a , K c . In the NO 2 molecule, having an unpaired electron (total electronic spin S = 1/2), each vibrotational level is split by the spin-rotational interaction into two components (J = N ± S) denoted by + or -, and the three rotational quantum numbers are N, K a , K c . For a given set of vibrotational quantum numbers the corresponding energies are obtained by a diagonalization of the effective Hamiltonian matrix of Eq. (3.

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Temperature Dependence of Air-Broadening and Shift Coefficients of O3Lines in the ν1Band

Smith

Devi

Benner

et al. 1997

Journal of Molecular Spectroscopy

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Measurements of Pressure Broadening and Shifts of O3 Lines in the 3-μm Region

Cited by 13 publications

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First pressure shift measurement of ozone molecular lines at 9.54 μm using a tunable quantum cascade laser

First pressure shift measurement of ozone molecular lines at 9.54 μm using a tunable quantum cascade laser

Pressure broadening and shifting of vibrotational lines of atmospheric gases

Temperature Dependence of Air-Broadening and Shift Coefficients of O3Lines in the ν1Band

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Measurements of Pressure Broadening and Shifts of O3 Lines in the 3-μm Region

Cited by 13 publications

References 0 publications

First pressure shift measurement of ozone molecular lines at 9.54 μm using a tunable quantum cascade laser

First pressure shift measurement of ozone molecular lines at 9.54 μm using a tunable quantum cascade laser

Pressure broadening and shifting of vibrotational lines of atmospheric gases

Temperature Dependence of Air-Broadening and Shift Coefficients of O3Lines in the ν1Band

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First pressure shift measurement of ozone molecular lines at 9.54 μm using a tunable quantum cascade laser

First pressure shift measurement of ozone molecular lines at 9.54 μm using a tunable quantum cascade laser