Abstract
Further laboratory studies of emission by O(1 S) and by O2 A 3Σ + ,A′3Δ u andc 1Σ − in the oxygen afterglow lead to the conclusion that Barth's mechanism for the excitation of the auroral green line O 2 * +O(3P=O2+O(1S)−(1) is correct and that levelsv=6 and 7 of O2 A 3Σ + are Barth precursors. The value ofk 1=7×10−11 cm3 s−1 deduced for these levels is shown to be in fair agreement with atmospheric measurements.
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