The microwave spectrum of the trans conformer of ethyl acetate |
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Authors: | D. Jelisavac H.V.L. Nguyen W. Stahl I. Kleiner |
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Affiliation: | a Institute of Physical Chemistry, RWTH Aachen University, Landoltweg 2, D-52074 Aachen, Germany b Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA), UMR 7583 (CNRS/Univ. Paris 12 & Paris 7), Université de Paris 12, 61 avenue du Général de Gaulle, F-94010 Créteil cedex, France |
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Abstract: | The Fourier transform microwave spectrum of ethyl acetate has been measured under molecular beam conditions. The trans conformer, where all heavy atoms are located within a mirror plane, was identified after analyzing the spectrum by comparison with theoretical calculations. The barrier to internal rotation of the acetate methyl group was found to be only 99.57(11) cm−1 whereas for methyl torsion in the ethyl group a barrier of 1112.3(37) cm−1 was determined. A comparison between two theoretical approaches treating the internal rotation, the so-called RAM (Rho Axis Method) and CAM (Combined Axis Method), is also performed. |
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Keywords: | Microwave spectroscopy Ethyl acetate Internal rotation |
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