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The measured radiative rates of the 2s22p2 3P1,2 - 2s2p3 5S{\deg}2intercombination transitions in neutral carbon reported in the literature arecritically evaluated by comparing them with theoretical and semi-empiricalresults. The experimental and theoretical values are compared for the carbonisoelectronic sequence from neutral carbon to nine-times ionized phosphorous.We find strong support for the currently recommended theoretical data on C Iand conclude that the published measurements for this transition in neutralcarbon cannot be trusted. The reasons for the discrepancies are not clear, andnew experiments are needed.

Radiative rates of transitions from the 2s2p$^{3}$ $^{5}$S{\deg}$_{2}$ level of neutral carbon