Analysis of the [formula omitted], [formula omitted], [formula omitted] and the [formula omitted] bands of HT[formula omitted

Abstract

We present the ν1+2ν2, ν2+ν3, ν1+ν3 and the 2ν2+ν3 bands of HT16O that have been analyzed for the first time using a high-resolution infrared spectrum of tritiated water vapour. The spectrum has been recorded from a custom-built light-pipe cell at room temperature using a Bruker 125HR Fourier-transform spectrometer at a resolution of.0075 cm−1.In the range from 4715 to 5300 cm−1, we report 446 new experimental line positions assigned to the ν1+2ν2 and 611 new line positions belonging to the ν2+ν3 band.In the range of 5830 to 6440 cm−1, 165 new experimental line positions were determined for the ν1+ν3 band and 81 line positions were assigned to the 2ν2+ν3 band.The analysis reveals a systematic shift of the individual line positions compared to the variationally calculated line positions from the Tomsk database which uses the potential energy surface of Partridge and Schwenke. Furthermore, it is observed that the differences between prediction and experiment are depending on the rotational quantum number Ka′.For each band, the assigned lines were used to determine the spectroscopic constants in the A-reduced Watson Hamiltonian.With a total of 1303 new line positions for HT16O we roughly double the number of experimental line positions for this species.