The b 1Σ+ → X 3Σ− transition in PH: A measurement of the term energy, bond length, and vibrational frequency of a phosphinidene metastable

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Abstract
The (0,0), (1,1), and (2,2) vibrational bands of the weak, spin forbidden b 1Σ+ → X 3Σ− transition of the PH radical have been observed in a flowing afterglow of PH3 in He. The spectra yield the following constants for the upper b state: Te =(14 325.5±0.1) cm−1, Be =(8.587±0.003) cm−1, we =(2403.0±0.1) cm−1, Dv =(4.0±0.05×10−4) cm−1, αe =(0.0253±0.003) cm−1, and re =(1.4178±0.0004) Å. The intensity distribution is consistent with the mixing of the b 1Σ+ state almost exclusively with the A 3Π state.