Microwave spectrum,dipole moment and barrier to internal rotation of trans-methyl glyoxal |
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Authors: | CE Dyllick-Brenzinger A Bauder |
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Institution: | Laboratory for Physical Chemistry, Swiss Federal Institute of Technology, CH-8092 Zurich, Switzerland |
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Abstract: | The microwave spectrum of the trans conformer of methyl glyoxal has been investigated in the frequency range from 8 to 40 GHz. The rotational constants have been determined for the A state: A = 9102.4332(31), B = 4439.8832(27) and C = 3038.9404(22) MHz. Quantitative measurements of the Stark effect have yielded the components of the electric dipole moment: μa = 0.1597(11), μb = 0.9620(7) and μtotal = 0.9751(7) D. From the splittings of rotational transitions the three-fold barrier to internal rotation of the methyl top has been found to be V3 = 269.1 (3) cm?1. |
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