Slit-jet Fourier transform infrared spectroscopy in 12C2H4: cold and hot bands near 3000 cm−1

A Fourier transform interferometer was used to record the slit-jet absorption spectrum of 12C2H4 between 2500 and 3500 cm−1 at a spectral resolution of 0.02 cm−1. The rotational analysis of the ν9 and ν11 fundamental and ν2+ν12 combination bands is performed, effective rotational parameters are presented, and relative absorption intensities are measured. In addition, a few lines of the 2ν10+ν12 band are assigned. The selective sampling of vibrational hot bands in the jet is demonstrated using another experimental apparatus, with a heated slit.