The rotationally resolved origin band in the electronic spectrum of cyclic has been observed by cavity ring down spectroscopy in the gas phase. The molecule was generated in a supersonic planar plasma containing decaborane and neon as a carrier gas. The rotational structure pattern is that of a cyclic molecule. It is analyzed assuming an equilateral triangle in both electronic states. The band origin is determined to be 21 853.52 cm−1, and the bond lengths 1.603 77(106) Å in the ground and 1.619 07(96) Å in the excited electronic state are inferred from analysis of the rotational structure.
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