Analysis of the high-resolution spectrum of acetylene in the 2.4 μm region

The high-resolution Fourier transform spectrum of acetylene in the 2.4 μm region has been obtained at an apodized resolution of 0.0054 cm −1 . In the analysis of the ( ν 1 + ν 4 + ν 5 ) 2.0 ← ν 4 1 and ( ν 1 + 2 ν 5 ) 2.0 ← ν 5 1 hot bands occurring in this region, the vibrational and rotational l -type resonances have been explicitly taken into consideration. The spectral data have been fitted with residuals approaching the experimental accuracy and molecular parameters have been obtained for the bands investigated. The present studies have also shown that the assignments of the ( ν 1 + ν 4 + ν 5 )(Σ u − ) ← ν 4 (Π g ) and ( ν 1 + ν 4 + ν 5 )(Δ u ) ← ν 4 (Π g ) subbands reported by previous workers must be interchanged.