Terahertz spectroscopy applied to the measurement of strengths and self-broadening coefficients for high-J lines of OCS |
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| Authors: | S Matton F Rohart G Mouret A Cuisset |
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| Institution: | a Laboratoire de Physico-Chimie de l’Atmosphère (LPCA), UMR CNRS 8101, Université du Littoral Côte d’Opale, 189 A, Avenue Maurice Schumann, 59140 Dunkerque, France
b Laboratoire de Physique des lasers, Atomes et Molécules (PhLAM), UMR CNRS 8523, Université des Sciences et Technologies de Lille, 59655 Villeneuve d’Ascq Cedex, France |
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| Abstract: | A spectrometer operating in the 100-2000 GHz range and allowing for absolute line strength measurements has been developed. The continuous wave terahertz radiation is generated by mixing two Ti:Sapphire laser beams in a vertically integrated low temperature grown GaAs (LTG-GaAs) photomixer. Pure rotational lines of 16O12C32S in the ground vibrational state have been considered for J values up to 90. Observed self-broadening parameters are in agreement with those deduced from infrared experiments. For the first time in the submillimeter range, absolute line strengths have been determined, allowing for a determination of the electric dipole moment in good agreement with the value previously obtained from Stark effect measurements. |
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| Keywords: | THz spectroscopy Photomixer Carbonyl sulfide OCS Pressure broadening Line intensity Electric dipole moment |
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