The chemistry of SF6 vapor reacting in the F region is critically examined. The SF6 molecule dissociatively attaches an electron, producing the SF5- ion. Reaction between an ambient O+ ion and the SF5- yields mutual neutralization. During the neutralization process, an electronically excited oxygen atom, O(1D), may be produced which will subsequently emit a 630.0-nm photon. A release of 20 kg of SF6 into an ambient O+ ion concentration of 105 cm-3 at 300-km altitude is considered. The 630.0-nm airglow intensity may increase following the release. The negative ion plasma is shown to be marginally unstable to a gradient drift instability.