Knowledge Bank

The recent vibrational analysis of the $A¯-X¯$ band system in $C2HD$, performed on the basis of conventional high resolution absorption spectra and of fluorescence excitation jet cooled spectra (1), allows to reinvcstigate the rotational analysis of the former ones. The vibrational assignments are indeed needed to support the rotational investigation, because of strong overlapping mainly with $C2H2$ bands present as impurity, which limits the available information. Several related subbands of this very specific band system (2-5) can be fully rotationally analysed and simultaneously fitted to an appropriate Hamiltonian. Results will be presented, in connection with previous studies on other isotopomers (4,5).