Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26as...70..269g&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 70, no. 2, Aug. 1987, p. 269-280.
Astronomy and Astrophysics
Astrophysics
45
Atomic Excitations, Cosmic Gases, Electron Impact, Electron Transitions, Hydrogen Atoms, Transition Probabilities, Electron Energy, Scattering Cross Sections
Scientific paper
Using the most recent theoretical and experimental estimates of the cross-sections, the authors present numerical approximations for the value of the atomic hydrogen bound-bound effective collision strength due to electron impact as a function of electron temperature. The effective collision strength Γ is computed for transitions between the first 15 levels of principal quantum number n; for the first 4 principal levels Γ is given separately for sublevels of different orbital quantum number l. The numerical fits can be used for the evaluation of collisional transition rates in the range of electron temperatures between 5000K and 500,000K.
Giovanardi Carlo
Natta Antonella
Palla Fabrizio
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