Far-Infrared Laser Magnetic Resonance of X̃2A′ trans-DOCO

Abstract Far-infrared laser magnetic resonance spectroscopy is used to measure components of 12 rotational transitions in the deuterated hydroxyformyl radical. Ten different FIR laser lines are employed at wavelengths between 339 and 663 μm. The assigned transitions are all b -dipole in character. The new data complement the previously reported a -dipole spectrum [Radford et al. , J. Chem. Phys. 97 , 3989-3995 (1992)] recorded in the millimeter-wave region. All of the existing high-resolution rotational spectra are subjected to a least-squares fit to the parameters appearing in the effective Hamiltonian describing the ground state of DOCO. The resulting parameters reproduce the existing spectroscopic observations to within the experimental accuracy and will be useful for predicting new spectra. The strongest resonances are well suited for future kinetics investigations of the radical.