Abstract
Optical absorption bands at ∼18772 and ∼18807 cm−1, previously assigned to A2Δ-X2Π electronic origin band transitions of the linear carbon-chain radicals C5H and C5D, respectively, have been reinvestigated. The spectra have been recorded in direct absorption applying cavity ring-down spectroscopy to a supersonically expanding acetylene/helium plasma. The improved spectra allow deducing a l-C5H upper state spin-orbit coupling constant A′=−0.7(3) cm−1 and a A2Δ lifetime of 1.6±0.3 ps.
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