The equation representing the decomposition of phosphine by flash photolysis is shown to be PH3 → Pred + 3/2H2. The phosphorus is produced in the form of small particles which remain suspended in the gas phase for several minutes provided that the total pressure is high enough. The variation with time of the spectra of PH2, PH and P2 has been studied and the secondary reactions consequent upon the photolysis are shown to be homogeneous. The P2 is produced in a vibrationally excited state at room temperature, transitions involving levels of up to v' = 7 being observed. A mechanism for the photolysis and the production of excited P2 is proposed.
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Norrish et al. (1961) studied this question.
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