The Fourier transform absorption spectrum of acetylene between 8280 and 8700 cm−1

- Fourier Transform Spectroscopy of acetylene between 8280 and 8700 cm−1.
- Line positions, intensities of 1001 lines were derived, including 114 13C12CH2 lines.
- Predictions of the global effective Hamiltonian were used to assign the spectrum.
- 629 12C2H2 lines rovibrationally assigned to13 bands, 9 bands being new.
- Comparison to the HITRAN list is discussed.

High resolution (0.011 cm-1) room temperature (295 K) Fourier transform absorption spectra (FTS) of acetylene have been analyzed in the 8280-8700 cm−1 range dominated by the ν1+ν2+ν3 band at 8512 cm−1. Line positions and intensities were retrieved from FTS spectra recorded at 3.84 and 56.6 hPa. As a result, a list of 1001 lines was constructed with intensities ranging between about 2×10−26 and 10−22 cm/molecule. Comparison with accurate predictions provided by a global effective operator model led to the assignment of 629 12C2H2 lines. In addition, 114 lines of the 13C12CH2 isotopologue were assigned using information available in the literature. The 12C2H2 lines belong to thirteen bands, nine of which being newly reported. The 13C12CH2 lines belong to three bands, the intensities of which being reported for the first time. Spectroscopic parameters of the 12C2H2 upper vibrational levels were derived from band-by-band analyses of the line positions (typical rms are on the order of 0.002 cm−1). Three of the analyzed bands were found to be affected by rovibrational perturbations, which are discussed in the frame of a global effective Hamiltonian. The obtained line parameters are compared with those of the two bands included in the HITRAN 2012 database.