The formation efficiencies of singlet oxygen for the oxygen quenching in excited singlet of aromatic hydrocarbons; A and for the quenching in the triplet T1; B were estimated. The hydrocarbons were classified into three types: (i) A = 1 and B = 1 for dicyanoanthracene i.e., total 200% efficiency, (ii) A ≈ 0.3 and B = 1 for anthracene, (iii) A ≈ 0 and B = 1 for pyrene, as examples. It is suggested that the energy levels of T2 and a dissociative exciplex; (T11Δg) correlated to A and B values from the energetic considerations.
The results of a study of an improved new method for generating O 2 ( 111) for use in a chemical oxygen-iodine laser are presented. The generator, using a porous pipe, was found to produce O 2 ( I!J.) with an excitation efficiency of more than 80% and a maximum production of O 2 molecules from the unit surface area 01'2.2 mmol min-! cm-2 has been attained.
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