The collisional process O(3P)+O(3P)→O(1D)+O(1D) is investigated. It is found that the excitation cross section is comparable to that of the single-excitation process O(3P)+O(3P)→O(3P)+O(1D). The process enhances the intensity of the 6300-¿ red line emission arising from the deposition into the atmosphere of energetic O+ ions which undergo charge transfer to produce fast oxygen atoms. ¿ American Geophysical Union 1993