Radiative lifetimes have been measured for five triplet states of atomic oxygen. The oxygen atoms were generated by photodissociation of NO₂ and the investigated states were populated through a two-step process involving a two-photon excitation to the lowest excited triplet state of even parity, 2p³3p ³P, followed by a one-photon excitation to the investigated state. A similar scheme is applicable to the study of excited states in many light atoms.
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Kröll et al. (1985) studied this question.
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