On the simultaneous ionization-excitation of the OII(λ834 Å) resonance transition by electron impact on atomic oxygen期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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On the simultaneous ionization-excitation of the OII(λ834 Å) resonance transition by electron impact on atomic oxygen

Authors:	EC Zipf WW Kao PW Erdman

Institution:	Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA 15260, U.S.A.

Abstract:	Laboratory cross-section data on the excitation of the OII(2s 2p⁴⁴P → 2s² 2p³⁴S; λ834 Å) resonance transition and on the production of O⁺ and O²⁺ ions by electron impact on atomic oxygen are used to show that the ratio $σ(λ834 A ?) σ(O^{+} + O^{2+})$ is nearly constant for incident electron energies > 50 eV. Under auroral conditions, the total electron-ion pair production rate from electron impact on O can be inferred from λ834 Å volume emission rate measurements using the result that $η(O^{+} + O^{2+}) $ ? 8.4η(λ834 A ?)$ . These findings, along with earlier work on the simultaneous ionization-excitation of the 1 Neg (0,0) band of N₂⁺ and the 1 Neg (1, 0) band of O⁺₂, allow the specific ionization rates for the principal atmospheric constituents (O⁺, O⁺₂, N⁺₂), for the multiply-ionized species (O²⁺, O²⁺₂, N²⁺₂), and for the dissociatively produced atomic ions to be inferred in aurora from remote satellite observations.

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