High resolution spectroscopy of asymmetric top molecules in nonsinglet electronic states: the ν fundamental of chlorine dioxide (OClO) free radical in the XB electronic ground state.

Highly resolved spectra of the OClO isotopologue of chlorine dioxide were recorded with a Bruker IFS 125HR Fourier transform infrared spectrometer in the region of the ν band. The analysis was made in the frame of the spin-rotational effective Hamiltonian (in A-reduction and I-representation) taking into account spin-rotational coupling operators up to the sixth order and the corresponding reduction of the Hamiltonian. The mathematical description of the ro-vibrational spectra was implemented to the specially created computer program ROVDES.