Abstract
Abstract The b → X emission of electronically excited O2 isolated in Ar solids was observed under the pulsed KrF excimer laser irradiation at 248 nm. The relaxation proceeds along the b → a → b interstate transition. The time evolution of each b → X (v′, v′′) band was fitted by multi-exponential curves. The nonradiative rate is limited at the b → a transition due to the energy gap, which is larger than that of the a → b transition. The relaxation rate constants of individual vibrational levels (v ≤ 8) of the b state were determined. The vibrational quantum number and temperature dependence of the nonradiative rate constants could be explained based on a multiphonon relaxation theory.
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