Abstract
The first excited C–C–H bending vibration levels in the CaCCH Ã2Π and X2Σ+ states have been rotationally analyzed through cw dye laser excitation spectroscopy of the band. The upper state is subject to Renner–Teller and spin–orbit splittings. Strong K-type resonance interactions were observed between the nearby 2Δ and 2Σ vibronic components. A total of 667 rotational lines were recorded with high precision and fitted to a model involving a full matrix treatment of the interactions. The Renner–Teller parameter has been determined as ϵ4ω4 = 1.85(4) cm−1.
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