Recommended acetylene line list in the 20-240 cm-1 and 400-630 cm-1 regions: New measurements and global modeling

A new recommended (C2H2)-C-12 line list for the 13-248 cm(-1) and 390-634 cm(-1) regions is presented. It is based on the results of the global modeling of the line positions and intensities performed in Tomsk within the framework of the method of effective operators. To validate the Tomsk calculations new measurements of both line positions and intensities were performed using acetylene spectra recorded between 25 and 680 cm(-1) with the AILES-A beamline of SOLEIL synchrotron. Line positions and intensities of 627 transitions belonging to 9 bands have been measured for the first time in this region. Using the results of these new measurements and the published results of the measurements in the 13-248 cm(-1) and 390-634 cm(-1) regions performed with the same facilities new fittings of the line intensities for the Delta P=0 and Delta P=1 series of transitions have been performed. Here P=5v(1)+3v(2)+5v(3)+v(4)+v(5) is a polyad number, where v(1), v(2), v(3), v(4), and v(5) are the principal quantum numbers of the acetylene harmonic oscillators. These new sets of the effective dipole moment parameters were used to generate the line list which contains the line positions and intensities of 39 and 29 bands, respectively for the Delta P=0 and Delta P=1 series of transitions. None of these bands is present in the HITRAN 2012 [8] and GEISA 2015 [9] databases. This paper presents the first part of a global work on the validation of Tomsk calculations. (C) 2017 Elsevier Ltd. All rights reserved.