New infrared integrated band intensities for HC3N and extensive line list for the ν5 and ν6 bending modes

Synthetic spectra calculation has been performed for the ν5 and ν6 bands on the basis of the best available high resolution data. It has been shown that the GEISA line parameters for HC3N are not sufficient to reproduce the band intensities and some hot band features observed in our experimental spectra at room temperature. As a first step, the model spectra has been improved by including a number of missing hot subbands and by calculating accurately the hot band relative intensities. Finally, a perfect agreement between calculated and observed spectra was achieved on the basis of a global analysis of HC3N levels up to 2000 cm−1 combined with the new integrated intensity measurements. A new extensive line list for the ν5 and ν6 bending modes of HC3N has been compiled.