Abstract
Laser magnetic resonance spectra arising from eight rotational transitions of PH 2 in its vibronic ground state have been measured in the far infrared region. Analysis of the spectra yields more accurate rotational, centrifugal distortion and fine structure parameters than previous spectroscopic results. Determination of the isotropic an anisotropic hyperfine constant from the resolved 31P and proton hyperfine structure shows that the unpaired electron is essentially located in a 3p atomic orbital on the phosphorus atom.
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