| Автор | Doering, J. P. |
| Автор | Goembel, L. |
| Дата выпуска | 1991 |
| dc.description | The absolute direct differential and integral electron excitation cross sections for the atomic nitrogen <sup>4</sup>S<sup>o</sup> → 3s<sup>4</sup>P (λ1200 Å) transition have been measured at incident energies of 30, 50, and 100 eV. The differential cross sections (DCS) measured versus scattering angle were integrated to give the integral cross section (ICS) as a function of incident energy. The ICS has a maximum value of 66×10<sup>−18</sup> cm² near 50 eV. Above 50 eV, the direct excitation cross section is approximately a factor of two lower than the fluorescence cross section of Stone and Zipf (1973) when the latter is corrected for the recent change in the H<sub>2</sub> dissociative excitation reference cross section. This difference suggests that cascade accounts for ∼50% of the fluorescence emission above 50 eV. At 30 eV, the direct cross section is only 1/5 of the fluorescence cross section, suggesting that there is a strong cascade contribution to the fluorescence cross section from forbidden transitions to the 3p <sup>4</sup>D<sup>o</sup> and 3p <sup>4</sup>P<sup>o</sup> states just above threshold. The consequences of these new cross section values for aeronomy are discussed. |
| Формат | application.pdf |
| Копирайт | Copyright 1991 by the American Geophysical Union. |
| Тема | ATMOSPHERIC COMPOSITION AND STRUCTURE |
| Тема | Airglow and aurora |
| Тема | IONOSPHERE |
| Тема | Auroral ionosphere |
| Тема | Particle precipitation |
| Тема | MAGNETOSPHERIC PHYSICS |
| Тема | Auroral phenomena |
| Название | Absolute differential and integral electron excitation cross sections for atomic nitrogen: 1. The <sup>4</sup> S <sup>o</sup> → 3s<sup>4</sup>P (λ1200 Å) transition from 30 to 100 eV |
| Тип | shortCommunication |
| DOI | 10.1029/91JA01462 |
| Electronic ISSN | 2156-2202 |
| Print ISSN | 0148-0227 |
| Журнал | Journal of Geophysical Research: Space Physics |
| Том | 96 |
| Первая страница | 16021 |
| Последняя страница | 16024 |
| Выпуск | A9 |
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