2. Surface neutral chemistry on ice crystals.* 3. Attachment of electrons to ice crystals.* 4. Cross section of 0-H collision for excitation of fine structure transitions in atomic oxygen because collisional excitation of these transitions in 0-H collisions might cool atomic hydrogen below the ambient thermospheric temperature, and thereby reduce its escape (Fahr and Nass, 1979). *First of all do a simple model calculation to see whether the effects could be significant.
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