The bending vibrations in ¹²C₂H₂: global vibration–rotation analysis

Abstract

A total of 3155 vibration–rotation line positions providing accurate information on all known vibration–rotation states up to 3000 cm⁻¹ in ¹²C₂H₂ were gathered from the literature. An additional 966 lines were assigned on new spectra. The full data set was simultaneously fitted using an appropriate Hamiltonian, with 85 refined parameters. A dimensionless standard deviation equal to 0.86, accounting for 92% of the lines, was achieved. The vibrational transition dipole moment of the υ₅ = 1 ← υ₄ = 1 band observed in the far-infrared was estimated to be |μ_5←4| = 0.55 D with 20% accuracy, from absolute intensity measurements for a few Q-branch lines.

Notes

**FRIA researcher

***Senior Research Associate with the Fonds National de la Recherche Scientifique (Belgium)

****Research Associate with the Fonds National de la Recherche Scientifique (Belgium)

Additional information

Notes on contributors

S. Robert**

**FRIA researcher

J. Vander Auwera***

***Senior Research Associate with the Fonds National de la Recherche Scientifique (Belgium)

M. Lepere****

****Research Associate with the Fonds National de la Recherche Scientifique (Belgium)