Photodissociation of OSCl2 in the Vacuum Ultraviolet; the Heat of Formation of SO

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Abstract
The photodissociation of OSCl2 at the Kr (1165‐, 1236‐Å) lines has resulted in the production of SO A 3π, B 3Σ. The threshold energy of incident photons to produce the reaction, OSCl2→ lim hνSO A 3 Π0 + 2Cl2 P3/2, was 9.41 ± 0.03 eV from which Δ Hf0 ° (SO)=1.3 ± 0.7 kcal/mole is derived. The If/I0‐vs‐incident wavelength curve shows many diffuse bands found in the absorption spectrum of OSCl2 indicating that the process is predissociative. Various other methods to obtain Δ Hf0 ° (SO) are compared. It is concluded that the best value is 1.3 〈 Δ Hf0 ° (SO) 〈 0.8 kcal/mole .