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Recent laboratory measurements of the absolute cross sections f o r the excitation of the OI(3S) resonance s t a t e by electron impact on 0 and O2 when combined w i t h c -i n situ measurements o f the photoelectron energy distribution from 120 t o 300 km show t h a t photoelectron impact is the principal excitation mechanism f o r A1304 A resonance radiation i n the 0 dayglow; dissociative excitation of O2 is found t o play a minor role. The laboratory measurements indicate t h a t the 3S s tdoi:10.1029/ja076i028p06865 fatcat:jx4k7otahbbo3lp5blslcaxyhi