Abstract
ATOMIC oxygen is an important constituent of the mesosphere and lower thermosphere because of its role in the excitation of the O I(1S0-1D2) airglow emission at 557.7 nm (ref. 1) and because of its involvement in the positive and negative ion chemistry of the lower ionosphere2. In particular it destroys negative ions3 and can break reaction chains believed to produce water cluster ions below about 85 km (ref. 4). There is also uncertainty about the degree of dissociation of oxygen in the thermosphere5,6 and atomic oxygen is involved in many reactions with neutral hydrogen/oxygen compounds in the mesosphere7.
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