Pure-rotation band absorption intensities and dispersion of ammonia in the far infrared

1967 ◽  
Vol 2 (2) ◽  
pp. 61-76
Author(s):  
Eugene B. Bradley ◽  
Ernest A. Jones
Keyword(s):  
Far Infrared ◽  
Rotation Band ◽  
Pure Rotation ◽  
Band Absorption

The far-infrared spectrum of hydrogen sulfide. The (000) rotational constants of , , and

1983 ◽  
Vol 61 (10) ◽  
pp. 1462-1473 ◽  
Author(s):  
J.-M. Flaud ◽  
C. Camy-Peyret ◽  
J. W. C. Johns
Keyword(s):  
Hydrogen Sulfide ◽  
Signal To Noise Ratio ◽  
Far Infrared ◽  
Infrared Region ◽  
Rotational Constants ◽  
Pure Rotation ◽  
Isotopic Species ◽  
Least Squares Fit ◽  
Rotational Transitions ◽  
Good Signal

The pure rotation spectrum of hydrogen sulfide has been recorded between 50 and 320 cm−1 with a Fourier transform spectrometer at an apodized resolution of 0.005 cm−1. This high resolution and a good signal-to-noise ratio lead to a significant improvement in the accuracy of the wavenumbers of the rotational transitions of the three isotopic species [Formula: see text], [Formula: see text], and [Formula: see text] that were observed in natural abundance. These rotational transitions, together with the available microwave data, have been included in a least squares fit leading to the determination of precise rotational constants for each isotopic species. Finally, these constants have been used to calculate precisely the absorption of natural hydrogen sulfide in the far-infrared region of the spectrum.

Fourier transform far-infrared spectroscopy of HN2+ on the AILES beamline of synchrotron SOLEIL

2013 ◽  
Vol 91 (11) ◽  
pp. 937-940 ◽  
Author(s):  
S. Gruet ◽  
A. Morvan ◽  
O. Pirali ◽  
T. Chamaillé ◽  
E. Bouisset ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Broad Band ◽  
Far Infrared ◽  
Far Infrared Spectroscopy ◽  
Pure Rotation ◽  
Frequency Tunable ◽  
Discharge Cell ◽  
Rotation Spectrum ◽  
Far Infrared Spectra

We report the pure rotation spectrum of HN2+ as measured by Fourier transform (FT) absorption spectroscopy in the 20–40 cm−1 spectral range. The cations are produced in a liquid nitrogen cooled hollow cathode discharge cell developed on the AILES beamline of synchrotron SOLEIL. The setup was optimized by recording rotation–vibration spectra of H3+ (with the ν2 band centered at about 2521 cm−1), HN2+ (with the ν1 band centered at about 3234 cm−1), and HCO+ (with the ν1 band centered at about 3089 cm−1). Many rotation–vibration lines have been assigned for each ion and five pure rotational transitions have been detected for HN2+. These results demonstrate the feasibility of recording far-infrared spectra of cationic species using FT broad band spectroscopy associated with the bright synchrotron radiation continuum as an alternative to laser-based frequency tunable techniques.

Broad band absorption of solutes in liquid solutions and in polystyrene

1977 ◽  
Vol 55 (12) ◽  
pp. 2411-2416
Author(s):  
C. K. McLellan ◽  
S. Walker
Keyword(s):  
Broad Band ◽  
Far Infrared ◽  
Infrared Region ◽  
Frequency Range ◽  
Molecular Relaxation ◽  
Liquid Benzene ◽  
Polystyrene Matrix ◽  
Liquid Solutions ◽  
Polar Solutes ◽  
Band Absorption

Broad band absorptions in the frequency range 20 to 100 cm−1 arising from four polar solutes in polystyrene matrices have been observed at 302 K and compared with those in liquid benzene or cyclohexane solutions. A broad band was also found for 1,4-diacetylbenzene in a polystyrene matrix at 124 K. The broad band absorption still occurs in the far-infrared region when group and/or molecular relaxation(s) occur in appreciably lower frequency regions. The significance of these absorptions is discussed in terms of some models which account for the origins of broad band absorptions.

Far-infrared difference-band absorption in potassium iodide

1989 ◽  
Vol 39 (14) ◽  
pp. 10352-10355 ◽  
Author(s):  
S. P. Love ◽  
W. P. Ambrose ◽  
A. J. Sievers
Keyword(s):  
Potassium Iodide ◽  
Far Infrared ◽  
Band Absorption

Pure Rotation Spectrum of NNO in the Far Infrared Region

1990 ◽  
Vol 45 (6) ◽  
pp. 837-838 ◽  
Author(s):  
Koichi M. T. Yamada
Keyword(s):  
Vibrational State ◽  
Far Infrared ◽  
Infrared Region ◽  
Submillimeter Wave ◽  
Fourier Transform Spectrometer ◽  
Rotational Spectrum ◽  
Precise Data ◽  
Pure Rotation ◽  
Least Squares Fit ◽  
Rotation Spectrum

AbstractThe pure rotational spectrum of NNO has been observed as an impurity in the NO spectrum which has been recorded with a high resolution Fourier transform spectrometer. The observed high-J transitions in the ground vibrational state were analyzed by a least-squares fit together with the available millimeter and submillimeter wave data. It has been proved that the highly precise data of Maki et al. [3] can be used as a wavenumber standard for the far infrared.

scholarly journals Recent advances in measurement of the water vapour continuum in the far-infrared spectral region

2012 ◽  
Vol 370 (1968) ◽  
pp. 2637-2655 ◽  
Author(s):  
Paul D. Green ◽  
Stuart M. Newman ◽  
Ralph J. Beeby ◽  
Jonathan E. Murray ◽  
Juliet C. Pickering ◽  
...  
Keyword(s):  
Water Vapour ◽  
Spectral Band ◽  
Far Infrared ◽  
Ir Radiation ◽  
Continuum Absorption ◽  
Pure Rotation ◽  
Wide Range ◽  
Infrared Spectral ◽  
Research Aircraft ◽  
The Continuum

We present a new derivation of the foreign-broadened water vapour continuum in the far-infrared (far-IR) pure rotation band between 24 μm and 120 μm (85–420 cm −1 ) from field data collected in flight campaigns of the Continuum Absorption by Visible and IR radiation and Atmospheric Relevance (CAVIAR) project with Imperial College's Tropospheric Airborne Fourier Transform Spectrometer (TAFTS) far-IR spectro-radiometer instrument onboard the Facility for Airborne Atmospheric Measurement (FAAM) BAe-146 research aircraft; and compare this new derivation with those recently published in the literature in this spectral band. This new dataset validates the current Mlawer–Tobin-Clough–Kneizys–Davies (MT-CKD) 2.5 model parametrization above 300 cm −1 , but indicates the need to strengthen the parametrization below 300 cm −1 , by up to 50 per cent at 100 cm −1 . Data recorded at a number of flight altitudes have allowed measurements within a wide range of column water vapour environments, greatly increasing the sensitivity of this analysis to the continuum strength.

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