12C 16O 2 line intensity FTS measurements with 1% assumed accuracy in the 1.5–1.6 μm spectral range

Abstract

Using Fourier-transform spectra and a multispectrum fitting procedure, 124 absolute line intensities of 12C 16O 2 are obtained for the cold band 30011–00001 and the hot band 01131–01101 between 6460 and 6950 cm −1. Vibrational transition dipole moments squared and Herman–Wallis coefficients are reported for each band. Cross comparisons made with previous experimental results and with data available in the HITRAN and Carbon Dioxide Spectroscopic Databank (CDSD), bring some confidence on the good level of accuracy of the present results. Motivated by the demanding needs of some atmospheric experiments dedicated to the survey of the carbon cycle, an additional evaluation of potential absolute line intensity measurement limit is also performed on recently published carbon dioxide absolute line intensity independent measurements. These are obtained in two different laboratories on the bands 30013–00001 and 30012–00001 both located in the 1.6 μm spectral window. It is shown that Fourier-transform experimental CO 2 line intensity determination is approaching the challenging required figure of about 0.3% accuracy needed for the survey of the atmospheric carbon cycle.