scholarly journals Emissivities of Fe III and Fe VI and Iron Abundances in Planetary Nebulae

1978 ◽  
Vol 76 ◽  
pp. 159-160
Author(s):  
R.H. Garstang ◽  
W. Derek Robb
Keyword(s):  
Electron Impact ◽  
Cross Sections ◽  
Planetary Nebulae ◽  
Statistical Equilibrium ◽  
Impact Excitation ◽  
Electron Impact Excitation ◽  
Equilibrium Equations ◽  
Line Intensities ◽  
Astrophysical Journal ◽  
Excitation Cross Sections

We have calculated electron impact excitation cross sections between most of the low metastable levels of the 3d6 configuration in Fe III and of the 3d3 configuration in Fe VI have also been computed. The statistical equilibrium equations have been solved for a range of electron temperatures and electron densities, and the resulting level populations used to calculate emissivities for the forbidden lines of Fe III and Fe VI. Comparisons with observed line intensities and abundance determinations in planetary nebulae are in progress. (Paper submitted to The Astrophysical Journal.)

scholarly journals Electron Impact Excitation Cross Sections for B III

1983 ◽  
Vol 36 (5) ◽  
pp. 659
Author(s):  
PS Ganas ◽  
M Aryafar ◽  
LP Gately
Keyword(s):  
Electron Impact ◽  
Excited States ◽  
Cross Sections ◽  
Born Approximation ◽  
Oscillator Strengths ◽  
Impact Excitation ◽  
Electron Impact Excitation ◽  
Central Potential ◽  
Excitation Cross Sections ◽  
Generalized Oscillator

A realistic analytical central potential with two adjustable parameters is used to generate wavefunctions for the ground and excited states of doubly ionized boron. Generalized oscillator strengths and integrated cross sections from threshold up to 5 keY are calculated in the Born approximation for 2s-ns, 2s-np and 2s-nd excitations. Convenient analytic formulae for the cross sections are presented.

scholarly journals Electron-impact excitation cross sections for allowed transitions in atoms

1996 ◽  
Vol 53 (4) ◽  
pp. 2425-2432 ◽  
Author(s):  
V. Fisher ◽  
V. Bernshtam ◽  
H. Golten ◽  
Y. Maron
Keyword(s):  
Electron Impact ◽  
Cross Sections ◽  
Impact Excitation ◽  
Electron Impact Excitation ◽  
Excitation Cross Sections

scholarly journals Cross Sections for Electron Impact Excitation of O VI Lines

2011 ◽  
Vol 20 (4) ◽  
Author(s):  
Haykel Elabidi ◽  
Sylvie Sahal-Bréchot ◽  
Nébil Ben Nessib
Keyword(s):  
Fine Structure ◽  
Electron Impact ◽  
Cross Sections ◽  
Impact Excitation ◽  
Electron Impact Excitation ◽  
Atomic Data ◽  
Excitation Cross Sections

AbstractRadiative atomic data and electron impact excitation cross sections for the 2s-2p transitions in O VI for transitions among the fine structure levels belonging to the 1s

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