Spectroscopy and vibrational couplings in the 3v₃ region of acetylene

Abstract

14 rovibrational bands are observed in the 1 micron region of the absorption spectrum of C₂H₂, between 9300 and 10 500 cm^-1, and rotationally analysed. Transition induced dipole moments are estimated for all the cold bands involving upper levels of σ _u ⁺ symmetry. Those various data are used to demonstrate the leading role of the 0030⁰0⁰ level in the vibrational mixings and also to deal quantitatively with a possible picture of the couplings occurring among the cluster of levels in resonance with 0030⁰0⁰.

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Notes on contributors

M. Herman

Senior Research Associate with the National Fund for Scientific Research, Belgium.