Publications of Emmanuel Mahieu
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See detailSpectroscopic Measurements of Atmospheric Changes (SMAC), Belgian Impulse Programme GLOBAL CHANGE
Delbouille, L.; Roland, Ginette; Zander, Rodolphe ULiege et al

in Proceedings of the Symposium of Belgian Impulse Programme "Global Change" (1993)

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See detailESMOSII/NDSC - IR spectral fitting algorithms intercomparison exercise
Zander, Rodolphe ULiege; Demoulin, Philippe; Mahieu, Emmanuel ULiege et al

in Proceedings of Atmospheric Spectroscopy Applications, ASA Reims 1993, September 8-10 (1993)

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See detailGROUND-BASED INFRARED MEASUREMENTS OF CARBONYL SULFIDE TOTAL COLUMN ABUNDANCES - LONG-TERM TRENDS AND VARIABILITY
RINSLAND, C. P.; Zander, Rodolphe ULiege; Mahieu, Emmanuel ULiege et al

in Journal of Geophysical Research (1992), 97(D5), 5995-6002

Total vertical column abundances of carbonyl sulfide (OCS) have been derived from time series of high-resolution infrared solar absorption spectra recorded at the National Solar Observatory McMath solar ... [more ▼]

Total vertical column abundances of carbonyl sulfide (OCS) have been derived from time series of high-resolution infrared solar absorption spectra recorded at the National Solar Observatory McMath solar telescope facility on Kitt Peak (altitude 2.09 km, latitude 31.9-degrees-N, longitude 111.6-degrees-W), southwest of Tucson, Arizona, and at the International Scientific Station of the Jungfraujoch (altitude 3.58 km, latitude 46.5-degrees-N, longitude 8.0-degrees-E), in the Swiss Alps. The analysis of both data sets is based on nonlinear least squares spectral fittings of narrow intervals centered on lines of the intense nu-3 band of OCS, the P(37) transition at 2045.5788 cm-1 and the P(15) transition at 2055.8609 cm-1, with a consistent set of spectroscopic line parameters. The Kitt Peak measurements, recorded on 30 different days between May 1977 and March 1991, show a 10% peak-to-peak seasonal cycle with a summer maximum and a winter minimum and a trend in the total column abundance equal to (0.1 +/- 0.2)% yr-1, 2-sigma. Jungfraujoch solar spectra recorded on 67 different days between October 1984 and April 1991 have been analyzed. The fitted trend in the Jungfraujoch total columns, (-0.1 +/- 0.5)% yr-1, 2-sigma, is consistent with the Kitt Peak trend results within the errors. The Jungfraujoch total columns show a more complex seasonal variation than noted in the Kitt Peak data. The mean of the daily averaged total columns, 8.44 x 10(15) molecules cm-2 above Kitt Peak and 6.41 x 10(15) molecules cm-2 above the Jungfraujoch station, correspond respectively to mean tropospheric mixing ratios of 0.54 +/- 0.04 and 0.52 +/- 0.04 parts per billion by volume; these values are consistent with previously reported remote and in situ measurements. Taken together, the results from the two sites indicate that there has been no significant change in the OCS total column abundance at northern mid-latitudes over the last decade. [less ▲]

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See detailTHE TRIPLET-STATES OF ALBR
BREDOHL, Harald; DANGUY, P.; DUBOIS, Iwan et al

in Journal of Molecular Spectroscopy (1992), 151(1), 178-183

Twenty bands of the a3Πr-X1Σ+ transition of AlBr have been rotationally analyzed involving v′ from 0 to 10 and v″ from 0 to 8. The Π1 component is perturbed in the v = 0 and 1 vibrational levels. A new ... [more ▼]

Twenty bands of the a3Πr-X1Σ+ transition of AlBr have been rotationally analyzed involving v′ from 0 to 10 and v″ from 0 to 8. The Π1 component is perturbed in the v = 0 and 1 vibrational levels. A new system has been observed for the first time; it is formed of 26 bands and is interpreted as the b3Σ+-X1Σ+ transition. [less ▲]

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See detailTHE VUV ABSORPTION-SPECTRUM OF THE SIF FREE-RADICAL
REMY, François; Mahieu, Emmanuel ULiege; MACAUHERCOT, D. et al

in Journal of Molecular Spectroscopy (1992), 152(1), 131-136

The absorption spectrum of SiF has been observed down to the LiF absorption limit. Rydberg series nsσ npσ, and npπ have been observed up to n = 15, as well as two superexcited states.

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See detailThe 1985 chlorine and fluorine inventories in the stratosphere based on atmos observations at 30-degrees north latitude
Zander, Rodolphe ULiege; Gunson, Michael R.; Farmer, Crofton B. et al

in Journal of Atmospheric Chemistry (1992), 15(2), 171-186

The set of high-resolution infrared solar observations made with the Atmospheric Trace Molecule Spectroscopy (ATMOS) - Fourier transform spectrometer from onboard Spacelab 3 (30 April-1 May 1985) has been ... [more ▼]

The set of high-resolution infrared solar observations made with the Atmospheric Trace Molecule Spectroscopy (ATMOS) - Fourier transform spectrometer from onboard Spacelab 3 (30 April-1 May 1985) has been used to evaluate the total budgets of the odd chlorine and fluorine chemical families in the stratosphere. These budgets are based on volume mixing ratio profiles measured for HCl, HF, CH3Cl, ClONO2, CCl4, CCl2F2, CCl3F, CHClF2, CF4, COF2, and SF6, near 30-degrees north latitude. When including realistic concentrations for species not measured by ATMOS, i.e., the source gases CH3CCl3, and C2F3Cl3 below 25 km, and the reservoirs ClO, HOCl and COFCl between 15 and 40 km (five gases actually measured by other techniques), the 30-degrees-N zonal 1985 mean total mixing ratio of chlorine, Cl, was found to be equal to (2.58 +/- 0.10) ppbv (parts per billion by volume) throughout the stratosphere, with no significant decrease near the stratopause. The results for total fluorine indicate a slight, but steady, decrease of its volume mixing ratio with increasing altitude, around a mean stratospheric value of (1.15 +/- 0.12) ppbv. Both uncertainties correspond to one standard deviation. These mean springtime 1985 stratospheric budgets are commensurate with values reported for the tropospheric Cl and F concentrations in the early 1980s, when allowance is made for the growth rates of their source gases at the ground and the time required for tropospheric air to be transported into the stratosphere. The results are discussed with emphasis on conservation of fluorine and chlorine and the partitioning among source, sink, and reservoir gases throughout the stratosphere. [less ▲]

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See detailRotational analysis of the a3Πr-X1Σ+ transition of 69Ga35Cl
Mahieu, Emmanuel ULiege; DUBOIS, Iwan; BREDOHL, Harald

in Journal of Molecular Spectroscopy (1991), 150(2), 477-485

Six bands (0-0, 0-1, 0-2, 1-0, 2-0, 2-1) of 69Ga35Cl have been fully analyzed for the a-X transition, yielding equilibrium constants for the a3Π, state.

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See detailNEW ROTATIONAL ANALYSIS OF THE ALPHA-1-PI-CHI-1-SIGMA+ TRANSITION OF ALBR
BREDOHL, Harald; DUBOIS, Iwan; Mahieu, Emmanuel ULiege et al

in Journal of Molecular Spectroscopy (1991), 145(1), 12-17

Twenty-eight bands of the A1Π-X1Σ+ transition have been fully analyzed. The vibrational constants obtained for the A1Π state do not agree with earlier data. On the other hand the observations suggest that ... [more ▼]

Twenty-eight bands of the A1Π-X1Σ+ transition have been fully analyzed. The vibrational constants obtained for the A1Π state do not agree with earlier data. On the other hand the observations suggest that the conclusion about the predissociation ought to be revised. [less ▲]

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See detailRotational analysis of the a3Πr-X1Σ+ transition of AlI
Mahieu, Emmanuel ULiege; DUBOIS, I.; BREDOHL, H.

in Journal of Molecular Spectroscopy (1990), 143(2), 359-365

The a3Πr-X1Σ+ transition of Al I has been analyzed for the first time. Accurate rotational and vibrational constants are given for the a3Πr electronic state.

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See detailThe rotational analysis of the B2Σ+-X2Πr transition of 74Ge35Cl
Mahieu, Emmanuel ULiege; DUBOIS, Iwan; BREDOHL, Harald et al

in Journal of Molecular Spectroscopy (1990), 143(1), 91-99

A complete rotational analysis of six bands of GeCl is given. It concerns the B2Σ+-X2Πr transition of the most abundant isotopic species, 74Ge35Cl.

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See detailThe a3Πr-X1Σ+ transition of BI
LEBRETON, J.; FERRAN, J.; Mahieu, Emmanuel ULiege et al

in Journal of Molecular Spectroscopy (1990), 141(1), 145-148

A new study of the a3Πr-X1Σ+ transition of BI has yielded precise molecular constants including spin-orbit and Λ-doubling constants of the a3Πr electronic state.

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See detailThe Triplet States of AlCl
Mahieu, Emmanuel ULiege; DUBOIS, Iwan; BREDOHL, Harald

in Journal of Molecular Spectroscopy (1989), 138(1), 264-271

The 0-0 band of the a3Πr-X1Σ+ transition has been fully analyzed. The b3Σ state observed by Sharma (Astrophys. J. 113, 210–218 (1951)) is shown to be a 3Δ state and the analysis of the 0-0, 0–1, and 0–2 ... [more ▼]

The 0-0 band of the a3Πr-X1Σ+ transition has been fully analyzed. The b3Σ state observed by Sharma (Astrophys. J. 113, 210–218 (1951)) is shown to be a 3Δ state and the analysis of the 0-0, 0–1, and 0–2 bands of the b3Δ-a3Πr transition has been completed. [less ▲]

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See detailThe A1Π-X1Σ+ transition of AlCl
Mahieu, Emmanuel ULiege; DUBOIS, Iwan; BREDOHL, Harald

in Journal of Molecular Spectroscopy (1989), 134(2), 317-328

The A1Π-X1Σ+ system of AlCl has been analyzed under high resolution. Accurate rotational and vibrational constants have been obtained for the two electronic states involved. A predissociation in the v ... [more ▼]

The A1Π-X1Σ+ system of AlCl has been analyzed under high resolution. Accurate rotational and vibrational constants have been obtained for the two electronic states involved. A predissociation in the v = 10 vibrational level of the A1Π state is discussed. [less ▲]

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