The Acetylene Laboratory IR Spectrum: New Quantitative Studies

Details The Acetylene Laboratory IR Spectrum: New Quantitative Studies The Acetylene Laboratory IR Spectrum: New Quantitative Studies

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aspc..450...83j&link_type=abstract

Molecules in the Atmospheres of Extrasolar Planets, proceedings of a conference held at Observatoire de Paris, Paris, France 19-

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The acetylene molecule 12C2H2 shows numerous vibration - rotation bands throughout the IR spectrum. Vibrational levels of C2H2 are grouped into clusters almost regularly spaced every 700 cm-1, from the fundamental ν5 band, at 13.6 μm, up to the visible. Several IR spectral regions where C2H2 bands occur have been extensively studied in the past years, mainly in order to obtain absolute individual line intensities and to improve spectroscopic databases as HITRAN or GEISA.
This quantitative spectroscopy work is performed with the aid of Fourier transform interferometers to obtain absorption spectra,
and using a multispectrum fitting procedure to retrieve line parameters from these spectra. For usual applications,
a semi-empirical model based on the Herman-Wallis factor is used to generate line lists dedicated to spectroscopic databases.
This poster gives a summary of all the spectral regions studied for acetylene 12C2H2, pointing out the current state of the
spectroscopic databases HITRAN/GEISA. Works in progress (around 1300 cm-1) and in project (0 - 500 cm-1) will also be presented. Data available in the literature, or obtained in the recent works, have been compiled to set up line lists usable for applications
and dedicated to databases. On the whole the number of transitions is twice compared to the actual HITRAN 2004 database plus the 2007
updates and is ranging from 700 to 9600 cm-1.

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