The first hexad {(040), (120), (021), (200), (101), (002)} of H218O: experimental energy levels and line intensities

1986 ◽  
Vol 64 (6) ◽  
pp. 746-761 ◽  
Author(s):  
J.-P. Chevillard ◽  
J.-Y. Mandin ◽  
C. Camy-Peyret ◽  
J.-M. Flaud
Keyword(s):  
Fourier Transform ◽  
Water Vapor ◽  
Energy Levels ◽  
Fourier Transform Spectrometer ◽  
Vibrational States ◽  
Line Intensities ◽  
Its Analysis ◽  
Experimental Energy

The spectrum of 18O-enriched water vapor has been recorded between 5900 and 8000 cm−1, with the aid of a Fourier-transform spectrometer. Its analysis allowed the determination of 437 accurate rotational levels belonging to the hexad of interacting states {(040), (120), (021), (200), (101), (002)}of H218O. Among these vibrational states, the (040), (120), and (002) ones had never been observed before. Moreover, 726 line intensities belonging to the 4ν2, ν1 + 2ν2, 2ν2 + ν3, 2ν1, ν1 + ν3, and 2ν3 bands have been measured with an uncertainty of 6%.

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%.

: 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%.

H218O: The (030), (110), and (011) interacting states. Line positions and intensities for the 3ν2, ν1 + ν2, and ν2 + ν3 bands

1985 ◽  
Vol 63 (8) ◽  
pp. 1112-1127 ◽  
Author(s):  
J.-P. Chevillard ◽  
J.-Y. Mandin ◽  
J.-M. Flaud ◽  
C. Camy-Peyret
Keyword(s):  
Vibrational State ◽  
Energy Levels ◽  
Fourier Transform Spectrometer ◽  
Vibrational States ◽  
Line Intensities ◽  
Moment Operator ◽  
Line Positions ◽  
Fermi Type ◽  
Effective Constants

The spectrum of oxygen-18 enriched water vapor was recorded between 4400 and 6100 cm−1 with the aid of a Fourier transform spectrometer. Its analysis allowed the determination of 60 energy levels of the (030) vibrational state of H218O and improvements in the knowledge of the energy levels belonging to the (110) and (011) vibrational states of this molecule. A fit of 330 rotational levels of the (030), (110), and (011) states was performed using 54 effective constants and taking into account the Coriolis-type and Fermi-type interactions. Moreover, 853 line intensities belonging to the 3ν2, ν1 + ν2, and ν2 + ν3 bands were measured. The constants involved in the rotational expansion of the transformed transition moment operator corresponding to these bands were determined through a fit of these line intensities. The constants obtained were then used to compute the whole spectrum of the 3ν2, ν1 + ν2, and ν2 + ν3 bands of H218O. This spectrum should be of interest for atmospheric studies.

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%.

Determination of the beam profile for the Herschel-SPIRE Imaging Fourier Transform Spectrometer

2013 ◽  
Author(s):  
Gibion Makiwa ◽  
David A. Naylor ◽  
Marc Ferlet ◽  
Carl Salji ◽  
Bruce Swinyard ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Beam Profile ◽  
Fourier Transform Spectrometer

Les intensités des raies rotationnelles du système b1Σ+ – X3Σ− de la molécule NF

1986 ◽  
Vol 64 (11) ◽  
pp. 1529-1533 ◽  
Author(s):  
M. Vervloet ◽  
J. K. G. Watson
Keyword(s):  
Fourier Transform ◽  
Ab Initio ◽  
Least Squares ◽  
Relative Size ◽  
Fourier Transform Spectrometer ◽  
Line Intensities ◽  
Transition Moments ◽  
Least Squares Fit

The 0–0 band of the b1Σ+ – X3Σ− system of the NF molecule has been measured in emission using a Fourier-transform spectrometer. The line assignments of Douglas and Jones are confirmed, but their statement regarding the relative size of the parallel and perpendicular transition moments is incorrect. From a least squares fit of the line intensities, we determine the value μ1/μ0 = 0.261 for the ratio of the perpendicular (μ1) and parallel (μ0) transition moments. This value lies between two recent ab initio estimates, 0.96 and 0.049.

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