Abstract
Triplet metastable species produced by intersystem crossing from the Ã(1Au) state of acetylene has been detected by the sensitized phosphorescence method. A sensitized phosphorescence signal was observed from vibronic levels lying lower than the potential energy barrier for dissociation in the ã state suggested previously, but was not observed from levels higher than this barrier. The lifetimes of triplet states produced by intersystem crossing from the V3K1(J′=2) and V4K1(J′=2) levels were estimated to be 100 and 80 μs.
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