title: The C-C-H Bending Vibration Mode (nu4) in the Electronic Ã2Pi and &Xtilde;2Sigma+ States of the CaCCH Radical.
abstract: The first excited C-C-H bending vibration levels in the CaCCH Ã2Pi and &Xtilde;2Sigma+ 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 2Delta and 2Sigma 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 epsilon4omega4 = 1.85(4) cm-1. Copyright 1999 Academic Press.
authors.affiliation: Department of Chemistry, Dalhousie University, Halifax, Nova Scotia, B3H 4J3, Canada
authors.initials: M
authors.lastname: Li
authors.initials: JA
authors.lastname: Coxon