Add time:08/09/2019         Source:sciencedirect.com

The absorption bands in the far infrared due to the torsional and in-plane skeletal bending vibrations have been examined in detail together with some mid-infrared bands. Torsional energy level spacings up to v13 = 5 for butadiene and up to v13 = 4 and 3, respectively, for the d4- and d6-compounds have been measured accurately, and the data used to investigate the nature of the potential function for rotation about the CC single bond. A Coriolis interaction between the torsion and the in-plane bending mode ν24 has been analyzed in detail.

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