Excitation of lithium atoms by electron impact

1983 ◽  
Vol 61 (1) ◽  
pp. 1-5
Author(s):  
P. S. Ganas
Keyword(s):  
Experimental Data ◽  
Electron Impact ◽  
Excited States ◽  
Cross Sections ◽  
Born Approximation ◽  
Wave Functions ◽  
Oscillator Strengths ◽  
Central Potential ◽  
Generalized Oscillator ◽  
Comparison Of The Results

A realistic analytic central potential is used to generate wave functions for the ground and excited states of lithium. Generalized oscillator strengths and integrated cross sections from threshold up to 5 keV are calculated in the Born approximation for 2s–ns, 2s–np and 2s–nd excitations. Comparison of the results with experimental data is discussed.

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.

Effective Oscillator Strengths of Neon from Electron Impact Excitation

1975 ◽  
Vol 53 (9) ◽  
pp. 850-853 ◽  
Author(s):  
D. Roy ◽  
J.-D. Carette
Keyword(s):  
Experimental Data ◽  
Electron Impact ◽  
Cross Sections ◽  
Electronic States ◽  
Oscillator Strengths ◽  
Impact Excitation ◽  
Electron Impact Excitation ◽  
Excitation Cross Sections ◽  
Relative Excitation ◽  
Good Agreement

From experimental data about relative excitation cross sections of many electronic states of neon, the effective oscillator strengths of these transitions have been computed. There is a good agreement between these results and the single available value of optical oscillator strength.

scholarly journals Systematic ion-atom interaction cross sections and stopping powers in the plane wave Born approximation

1995 ◽  
Vol 13 (2) ◽  
pp. 321-334 ◽  
Author(s):  
Eugene J. McGuire
Keyword(s):  
Plane Wave ◽  
Cross Sections ◽  
Born Approximation ◽  
Oscillator Strengths ◽  
Projectile Energy ◽  
Average Charge ◽  
Mass System ◽  
Plane Wave Born Approximation ◽  
Generalized Oscillator ◽  
Projectile Charge

In Chapter 14 of Atomic and Molecular Processes, Bates (1962) outlines a procedure for calculating ion-atom cross sections in the plane-wave Born approximation (pwBa). The procedure involves integration over the product of elastic scattering factors or generalized oscillator strengths for excitation or ionization from both projectile and target. We have programmed this procedure to use our large database of excitation and ionization generalized oscillator strengths (GOS). The program calculates both cross sections (CS) and stopping power (SP) on a subshell basis. The calculations are done in the center of mass system where the distinction between projectile and target is lost. Thus, the SP in the laboratory frames of both target and projectile are symmetrical in nuclear and net charges. The traditional simple modeling of SP, using scaled proton SP and an effective projectile charge, is unsymmetrical, and therefore dubious as a guide for extrapolating to ion-ion SP. At high projectile energy, the SP curves, as a function of increasing projectile charge, approach the scaled protonic result from above, indicating that lowering the average charge raises the SP, in contradiction to the traditional picture that the projectile SP increases with increasing effective charge (assuming there is an underlying physical reality relating the effective and average charge). Comparison with experimental SP data (mostly from 30 years ago) shows generally poor agreement for Li ion projectiles in the 1–10 MeV range.

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