Microwave spectra of HPO and DPO: molecular structure
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Microwave spectra of the unstable phosphorus containing molecule, HPO, and its deuterated species were measured in the frequency range of 70-380GHz. The molecule was produced by a DC-glow discharge of a gas mixture of PH3, CO2, and H2(D2). Rotational constants and centrifugal distortion constants for HPO and DPO were determined accurately. Harmonic force constants were evaluated from the centrifugal distortion constants determined in the present study, and with vibrational frequencies reported previously. The zero-point average structure for HPO was obtained by taking the isotopic difference of the PH bond length into consideration: rz(PH)=1.473(7)Å, rz(PO)=1.4843(9)Å, and 0z=104.57(16)o. The errors were estimated from the residual inertial defect. Equilibrium bond lengths for the PH and PO bonds were derived as 1.455(7) and 1.4800(9)Å, respectively, by assuming anharmonic constants of the corresponding diatomic molecules.
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