NDLI: Cross sections for electron impact excitation of astrophysically abundant atoms and ions

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Cross sections for electron impact excitation of astrophysically abundant atoms and ions

Content Provider	NASA Technical Reports Server (NTRS)
Author	Tayal, S. S.
Copyright Year	2006
Description	Electron collisional excitation rates and transition probabilities are important for computing electron temperatures and densities, ionization equilibria, and for deriving elemental abundances from emission lines formed in the collisional and photoionized astrophysical plasmas. Accurate representation of target wave functions that properly account for the important correlation and relaxation effects and inclusion of coupling effects including coupling to the continuum are essential components of a reliable collision calculation. Non-orthogonal orbitals technique in multiconfiguration Hartree-Fock approach is used to calculate oscillator strengths and transition probabilities. The effect of coupling to the continuum spectrum is included through the use of pseudostates which are chosen to account for most of the dipole polarizabilities of target states. The B-spline basis is used in the R-matrix approach to calculate electron excitation collision strengths and rates. Results for oscillator strengths and electron excitation collision strengths for transitions in N I, O I, O II, O IV, S X and Fe XIV have been produced
File Size	104787
Page Count	4
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20060052427
Archival Resource Key	ark:/13960/t9k40rr6s
Language	English
Publisher Date	2006-08-01
Access Restriction	Open
Subject Keyword	Astrophysics Electron Impact Collisional Plasmas Photoionization Polarization Characteristics Emission Spectra Oscillator Strengths Atomic Excitations Ions Abundance Targets Space Plasmas Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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