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

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Abstract
The PO radical has been detected by far‐infrared laser magnetic resonance (FIR LMR) using the CH3OH 369 μm and the CH3OD 305 μm laser lines as sources. The radical was generated by passing the microwave discharge products of H2O or of a H2/O2 mixture over powdered red phosphorus placed in an absorption cell. Subsequently, microwave spectroscopy was applied to observe low‐J transitions. The ground‐state molecular constants derived from the observed spectra are B=21 899.4915 (33), AeffJ=3.1026(30), D=0.031 120(42), p=188.01(51), qeff=−0.57(29), a=566.16(19), b=227.5(64), c=−415.3(64), and d=751.169(90), all in MHz with three standard errors in parentheses which apply to the last digits of the constants. The mechanism of the reaction generating PO is briefly discussed.