The electron-photon delayed coincidence technique has been extended to radiative lifetime measurements of excited simple free radicals. Dissociation processes of the parent molecules NH 3 and CH 4 leading to formation of the excited fragments NH and CH, respectively, have been studied. For the NH radical the following lifetimes are obtained: C 1 Pi (364+or-5) ns and A 3 Pi (347+or-5) ns; and for CH: A 2 Delta (440+or-20) ns.
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Cvejanović et al. (1978) studied this question.
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