Absolute line intensities for the ν3 band of oxirane (C2H4O)

2013 ◽  
Vol 91 (11) ◽  
pp. 906-909 ◽  
Author(s):  
M. Ngom ◽  
J.-M. Flaud ◽  
F. Kwabia Tchana ◽  
W.J. Lafferty ◽  
X. Landsheere ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Ethylene Oxide ◽  
Transition Moment ◽  
Line Intensities ◽  
Fourier Transform Spectra ◽  
Line Positions ◽  
Individual Line

Seven Fourier transform spectra of the ν3 band of oxirane (ethylene oxide) have been recorded with different pressures and used to derive individual line intensities. These line intensities were satisfactorily fit leading to accurate transition moment constants. An atlas of line positions and intensities has been generated.

: line positions and intensities between 9500 and 11500 cm−1. The interacting vibrational states (041), (220), (121), (022), (300), (201), (102), and (003)

1989 ◽  
Vol 67 (11) ◽  
pp. 1065-1084 ◽  
Author(s):  
J.-P. Chevillard ◽  
J.-Y. Mandin ◽  
J.-M. Flaud ◽  
C. Camy-Peyret
Keyword(s):  
Fourier Transform ◽  
Water Vapor ◽  
Energy Levels ◽  
Rotational Energy ◽  
Vibrational States ◽  
Line Intensities ◽  
Measured Line ◽  
Fourier Transform Spectra ◽  
Line Positions ◽  
Average Uncertainty

Water vapor Fourier-transform spectra (0.015 cm−1 resolution) were analyzed between 9500 and 11500 cm−1. Accurate values of 557 rotational energy levels, belonging to the interacting vibrational states (041), (220), (121), (022), (300), (201), (102), and (003) of the first decad of [Formula: see text], were determined. Moreover, 718 line intensities were accurately measured (7% uncertainty). To increase the number of experimental intensities (needed for atmospheric applications), a faster method, using the measured line depths, has made it possible to obtain 1695 additional intensities, with an average uncertainty of about 15%.

H216O: Line positions and intensities between 8000 and 9500 cm−1: the second hexad of interacting vibrational states: {(050), (130), (031), (210), (111), (012)}

1988 ◽  
Vol 66 (11) ◽  
pp. 997-1011 ◽  
Author(s):  
J. -Y. Mandin ◽  
J. -P. Chevillard ◽  
J. -M. Flaud ◽  
C. Camy-Peyret
Keyword(s):  
Fourier Transform ◽  
Water Vapor ◽  
Energy Levels ◽  
Rotational Energy ◽  
Vibrational States ◽  
Line Intensities ◽  
Fourier Transform Spectra ◽  
Set Up ◽  
Line Positions ◽  
Average Uncertainty

Water vapor Fourier-transform spectra (resolution = 0.010 cm−1) have been analyzed between 8000 and 9500 cm−1. Accurate values of 441 rotational energy levels, belonging to the vibrational states (050), (130), (031), (210), (111), and (012) of the second hexad of H216O, have been determined. Moreover, 500 line intensities have been accurately measured (uncertainty = 6%). To increase the number of experimental intensities (useful for atmospheric applications), we have set up a less sophisticated but faster method; this has led to the measurement of 1200 additional intensities, with an average uncertainty of about 10%.

H218O: line positions and intensities between 9500 and 11 500 cm−1. The (041), (220), (121), (300), (201), (102), and (003) interacting states

1987 ◽  
Vol 65 (7) ◽  
pp. 777-789 ◽  
Author(s):  
J. -P. Chevillard ◽  
J. -Y. Mandin ◽  
J.-M. Flaud ◽  
C. Camy-Peyret
Keyword(s):  
Fourier Transform ◽  
Water Vapor ◽  
Energy Levels ◽  
Rotational Energy ◽  
Fourier Transform Spectrometer ◽  
Vibrational States ◽  
Line Intensities ◽  
Line Positions ◽  
Average Uncertainty

The spectrum of 18O-enriched water vapor has been recorded between 9500 and 11 500 cm−1, with the aid of a Fourier-transform spectrometer. Its analysis has allowed the determination of 419 accurate rotational energy levels belonging to seven interacting vibrational states of H218O: (041), (220), (121), (300), (201), (102), and (003). Moreover, 622 line intensities belonging to the 4ν2 + ν3, 2ν1 + 2ν2, ν1 + 2ν2 + ν3, 3ν1, 2ν1 + ν3, ν1 + 2ν3, and 3ν3 bands have been measured with an average uncertainty of 6%.

The spectrum of natural hydrogen sulfide between 2150 and 2950 cm−1

1984 ◽  
Vol 62 (12) ◽  
pp. 1889-1923 ◽  
Author(s):  
L. Lechuga-Fossat ◽  
J.-M. Flaud ◽  
C. Camy-Peyret ◽  
J. W. C. Johns
Keyword(s):  
Hydrogen Sulfide ◽  
Energy Levels ◽  
Careful Analysis ◽  
Vibrational States ◽  
Line Intensities ◽  
Least Squares Fit ◽  
Coupling Parameters ◽  
Line Positions ◽  
Derivatives Of ◽  
Individual Line

Spectra of hydrogen sulfide have been recorded between 2150 and 2950 cm−1 with a Fourier transform spectrophotometer at a resolution of 0.01 cm−1. Most of the absorption in this region is due to the 2ν2, ν1, and ν3 bands of H232S, H233S, and H234S observed in natural abundance. A careful analysis of the spectra, combined with recent data on the ground states of the three isotopic species, led to an improved and extended set of rotational energy levels of the (020), (100), and (001) vibrational states of these isotopes. The rovibrational levels have been subjected to a least squares fit, using a Hamiltonian which takes the effects of Coriolis resonance explicitly into account, and precise rotational and coupling parameters have been determined.About 529 individual line intensities have been measured and from them it has been possible to deduce the expansion of the transformed transition moment operators of the three bands 2ν2, ν1, and ν3 and to determine the first derivatives of the dipole moment[Formula: see text]Finally, a complete list of line positions and intensities of natural hydrogen sulfide has been computed which should be of interest for the analysis of infrared spectra of the giant planets and for pollution studies.

scholarly journals MIPAS database: new HNO<sub>3</sub> line parameters at 7.6  µm validated with MIPAS satellite measurements

2016 ◽  
Vol 9 (5) ◽  
pp. 2067-2076 ◽  
Author(s):  
Agnès Perrin ◽  
Jean-Marie Flaud ◽  
Marco Ridolfi ◽  
Jean Vander Auwera ◽  
Massimo Carlotti
Keyword(s):  
Nitric Acid ◽  
Cross Sections ◽  
Michelson Interferometer ◽  
Absorption Cross ◽  
Satellite Measurements ◽  
Line Intensities ◽  
Atmospheric Sounding ◽  
New Generation ◽  
Line Positions ◽  
Individual Line

Abstract. Improved line positions and intensities have been generated for the 7.6 µm spectral region of nitric acid. They were obtained relying on a recent reinvestigation of the nitric acid band system at 7.6 µm and comparisons of HNO3 volume mixing ratio profiles retrieved from the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) limb emission radiances in the 11 and 7.6 µm domains. This has led to an improved database called MIPAS-2015. Comparisons with available laboratory information (individual line intensities, integrated absorption cross sections, and absorption cross sections) show that MIPAS-2015 provides an improved description of the 7.6 µm region of nitric acid. This study should help to improve HNO3 satellite retrievals by allowing measurements to be performed simultaneously in the 11 and 7.6 µm micro-windows. In particular, it should be useful to analyze existing MIPAS and IASI spectra as well as spectra to be recorded by the forthcoming Infrared Atmospheric Sounding Interferometer – New Generation (IASI-NG) instrument.

Calculated energy levels and intensities for the ν1 + ν2 and 3ν2 bands of HDO

1986 ◽  
Vol 64 (6) ◽  
pp. 736-742 ◽  
Author(s):  
A. Perrin ◽  
C. Camy-Peyret ◽  
J. -M. Flaud
Keyword(s):  
Least Squares ◽  
Strong Influence ◽  
Energy Levels ◽  
Rotational Energy ◽  
Transition Moment ◽  
Synthetic Spectrum ◽  
Vibrational States ◽  
Line Intensities ◽  
Least Squares Fit ◽  
Line Positions

A Hamiltonian taking into account both Fermi- and Coriolis-type interactions has been used to reproduce very satisfactorily the available rotational energy levels of the (1 1 0) and (0 3 0) interacting vibrational states of HDO. Then, a least squares fit of the line intensities of the ν1 + ν2 and 3ν2 bands of HDO has provided us with the transformed transition-moment operators of these two bands expanded in a form adapted to the Cs symmetry type of the molecule. The strong influence of the resonances on both line positions and intensities has been exemplified. Finally, the synthetic spectrum of the ν1 + ν2 and 3ν2 hybrid bands of HDO has been computed.

x–y Coriolis interaction in the ν5 and ν8 bands of propyne-d3

1993 ◽  
Vol 71 (10) ◽  
pp. 1684-1688 ◽  
Author(s):  
Geetha Rajappan ◽  
V.A. Job
Keyword(s):  
Fourier Transform ◽  
High Resolution ◽  
Fermi Resonance ◽  
Coriolis Interaction ◽  
Line Intensities ◽  
Transition Moments ◽  
Relative Value ◽  
Fourier Transform Spectra

High resolution Fourier transform spectra of the ν5 and ν8 bands of CD3C≡CH have been recorded and analyzed taking into account the strong x–y Coriolis interaction between these fundamentals. Fermi resonance of the ν8 state with the ν9 + ν10 state, l-type doubling interaction between the ± l components of ν8 and a weak k-type doubling interaction between the ν5 and ν8 states have also been included in the perturbation treatment. The parameters of the ν5 and ν8 states as well as some of the parameters of the unobserved ν9 + ν10 state have been determined. An estimate of the relative value of the transition moments has been obtained from the line intensities, which are strongly affected by the x–y Coriolis interaction.

scholarly journals MIPAS database: new HNO<sub>3</sub> line parameters at 7.6 μm validated with MIPAS satellite measurements

2015 ◽  
Vol 8 (11) ◽  
pp. 11643-11671 ◽  
Author(s):  
A. Perrin ◽  
J.-M. Flaud ◽  
M. Ridolfi ◽  
J. Vander Auwera ◽  
M. Carlotti
Keyword(s):  
Nitric Acid ◽  
Cross Sections ◽  
Michelson Interferometer ◽  
Absorption Cross ◽  
Satellite Measurements ◽  
Line Intensities ◽  
Atmospheric Sounding ◽  
New Generation ◽  
Line Positions ◽  
Individual Line

Abstract. Improved line positions and intensities have been generated for the 7.6 μm spectral region of nitric acid. They were obtained relying on a recent reinvestigation of the nitric acid band system at 7.6 μm and comparisons of HNO3 volume mixing ratio profiles retrieved from the "Michelson Interferometer for Passive Atmospheric Sounding" (MIPAS) limb emission radiances in the 11 and 7.6 μm domains. This has led to an improved database called "MIPAS-2015". Comparisons with available laboratory information (individual line intensities, integrated absorption cross sections, and absorption cross sections) show that MIPAS-2015 provides an improved description of the 7.6 μm region of nitric acid. This study should help to improve HNO3 satellite retrievals by allowing measurements to be performed simultaneously in the 11 and 7.6 μm micro-windows. In particular, it should be useful to analyze existing MIPAS and IASI spectra as well as spectra to be recorded by the forthcoming "Infrared Atmospheric Sounding Interferometer – New Generation" (IASI-NG) instrument.

Line positions and intensities for the 2ν2, ν1, and ν3 bands of H218O

1980 ◽  
Vol 58 (12) ◽  
pp. 1748-1757 ◽  
Author(s):  
J.-M. Flaud ◽  
C. Camy-Peyret ◽  
R. A. Toth
Keyword(s):  
Dipole Moment ◽  
Transition Moment ◽  
Complete Spectrum ◽  
Normal Coordinates ◽  
Line Intensities ◽  
Line Positions

A very good fit of 434 line intensities of the 2ν2, ν1 and ν3 bands of H218O has been performed leading to the determination of the constants involved in the expansion of the transformed transition moment operators relative to these three bands. It has been possible to derive the values of the coefficients of the expansion of the dipole moment with respect to normal coordinates: 22μx = 0.013 ± 0.003 D, 1μx = −0.020908 ± 0.00023 D, 3μx = 0.096867 ± 0.00099 D.Moreover, using the constants determined from the fit, the complete spectrum of the 2ν2, ν1 and ν3 bands of H218O has been computed including line positions, intensities, and assignments.

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