Global analysis of spectra of the Po-2 radical in the gas phase

A global analysis of all available and identified spectra of the PO2 radica l has been performed. In this analysis, the infrared spectra of the nu(3) b and, the microwave and far infrared laser magnetic resonance transitions in the ground state are fitted simultaneously to the effective Hamiltonian fo r asymmetric top molecules. Since the analysis absorbs reliable experimenta l data extensively, it bears the most precise and most complete set of mole cular constants for PO2. These molecular constants can, be used to reproduc e the spectra of PO2 accurately. Attention is also paid to the similarity a nd difference between PO2 and NO2.