Abstract
The excitation spectrum of a stable photoproduct of O 2 is recorded by monitoring the 1 S → 1 D emission of O in Ar matrices at 15 K between 200 and 100 nm. The time evolution and changes in intensity of the 1 S → 1 D emission of O at different excitation energies indicate the presence of a stable species of O in Ar matrices. It is proposed that the stable species which disappears upon warming to 30 K is O( 3P). When irradiated at 140 nm the 1 S → 1 D emission intensity of O increases and irradiation at 121 nm results in the bleaching of this emission. Based on the present study and theoretical data, the possibility that this species could be O 2 in a metastable site or O( 1D) in Ar matrices is ruled out.
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