Far-infrared laser magnetic resonance detection and microwave spectroscopy of the PO2 radical

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Abstract
Pure rotational transitions of the PO2 radical have been detected for the first time by far‐infrared laser magnetic resonance with a CO2 laser pumped laser as a source. The radical was generated by the reaction of red phosphorus with mirowave discharge products of an H2/O2 mixture. Microwave spectroscopy was subsequently applied to a similar reaction system to observe rotational transitions in the region of 82–161 GHz. The microwave and far‐infrared spectra thus observed were simultaneously analyzed using an asymmetric‐rotor Hamiltonian which includes the spin‐rotation and hyperfine interactions, to determine the rotational, spin rotation interaction, and magnetic hyperfine interaction constants. The observed rotational constants yield the r0 structure: r0 (P–O)=1.4665(41) Å and θ0(OPO)=135°17’(50), and the centrifugal distortion constants obtained give estimates for the vibrational frequencies: ω1=1090 cm−1, ω2=377 cm−1, and ω3=1278 cm−1.

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