Microwave spectrum of PHD: hyperfine structure
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The rotational spectrum of the monodeuterated PH2 radical was studied using a source-modulated submillimeter-wave spectrometer. The PHD radical was generated in a free space absorption cell by a dc-glow discharge in a gas mixture of PH3 and D2. Six a-type and 20 b-type rotational transitions were observed in the frequency region of 170-670GHz. Hyperfine structure due to the deuterium nucleus was resolved only in the rotational transitions of 111-000 and 110-101 and in the low F2 components of N=2-1 transitions. A total of 219 spectral lines were measured of which 145 were analyzed by least-squares methods. These yielded 34 precise molecular constants including the hyperfine coupling constants of phosphorus, hydrogen, and deuterium. The principal axes and principal values of the magnetic dipole coupling tensors of hydrogen in PH2 and deuterium in PD2 were derived from the observed values of PHD, PH2 and PD2. The principal axis of the hydrogen magnetic dipole coupling tensor in PH2 makes an angle of 2.29° with the PH bond and its T and T principal values are determined to be 12.93 and -18.39MHz, respectively.
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