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Preliminary results of a new measurement of the differential electron excitation cross section of the O I ( 3 P→ 1 D) transition near threshold confirm the presence of a large peak in the inelastic cross section at 5 to 6 eV. The new results are compared with previous measurements and theoretical calculations. The near‐threshold shape of the O I ( 3 P→ 1 D) cross section has interesting implications for the aeronomy of the thermosphere.
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J. P. Doering (1992) studied this question.
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