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- W2899631722 abstract "Different mechanisms for the dication production of molecular nitrogen and oxygen are reported here. It is shown that the ${mathrm{N}}_{2}$ dication is produced by direct double ionization, or TS-2, while the ${mathrm{O}}_{2}$ dication results primarily from an inner valence shell single ionization followed by a postcollisional Auger decay. In order to unveil these different characteristics of both production pathways, absolute cross-sectional measurements for the homoisotopic ${{mathrm{N}}_{2}}^{2+}$ and ${{mathrm{O}}_{2}}^{2+}$ by electron impact with energy ranging between 200 and 900 eV were measured. The separation of the doubly ionized parent molecules from the singly ionized fragments ${mathrm{N}}^{+}$ and ${mathrm{O}}^{+}$ was possible by employing the delayed extraction time-of-flight technique. The reasons for the two pure different pathways are discussed in the light of the present data, showing that while the single-ionization dication production process is impossible for nitrogen due to the energy levels limitations of its molecular orbitals, the direct double-ionization channel is strongly inhibited for oxygen due to geometrical constraints of its molecular orbitals orientation." @default.
- W2899631722 created "2018-11-16" @default.
- W2899631722 creator A5008780701 @default.
- W2899631722 creator A5027224696 @default.
- W2899631722 date "2018-11-07" @default.
- W2899631722 modified "2023-10-02" @default.
- W2899631722 title "Highly selective mechanisms for the production of <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:msub><mml:mi mathvariant=normal>N</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math> and <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:msub><mml:mi mathvariant=normal>O</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math> dications by electron impact" @default.
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- W2899631722 doi "https://doi.org/10.1103/physreva.98.052701" @default.
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