The Vibrational Ground State of 12CHD3

Abstract Within the scope of a general tensorial study of the 1000 and 2000 cm −1 polyads of CHD 3 , we have revisited the ground state of this molecule. Infrared ground state combination differences (GSCD) were calculated from 1746 transitions assigned in the ν 3 /ν 5 /ν 6 triad of CHD 3 . A set of 10 ground state parameters has been fitted to 613 GSCD providing an agreement of 0.00014 cm −1 between observed and calculated transitions. This corresponds to an improvement of about one order of magnitude with respect to the previous study, reflecting the quality of the experimental spectrum as well as a strict selection of the data used to fit the parameters.