The 1s–2s and 1s–2p excitation of helium ions by electron impact

1983 ◽  
Vol 61 (9) ◽  
pp. 1297-1300 ◽  
Author(s):  
Madhumita Basu ◽  
P. S. Mazumder ◽  
A. S. Ghosh
Keyword(s):  
Theoretical Prediction ◽  
Electron Impact ◽  
Cross Sections ◽  
The Other ◽  
Impact Excitation ◽  
Electron Impact Excitation ◽  
Orbital Method ◽  
Helium Ions ◽  
Excitation Cross Sections ◽  
Threshold Energies

The electron impact excitation of He+ to the n = 2 level is studied using two variants of the polarized orbital method, one due to Daskhan et al. and the other due to Temkin and Lamkin. The present results for 1s–2p total excitation cross sections are in fair agreement with the measured values. For the 1s–2s excitation, our values fail to reproduce the more elaborate theoretical prediction by Morgan near the threshold energies.

scholarly journals Positron Impact Excitation of the 2S State of Atomic Hydrogen

Atoms ◽  
2019 ◽  
Vol 7 (3) ◽  
pp. 69 ◽  
Author(s):  
A.K. Bhatia
Keyword(s):  
Electron Impact ◽  
Cross Sections ◽  
Atomic Hydrogen ◽  
Threshold Energy ◽  
Impact Excitation ◽  
Electron Impact Excitation ◽  
Orbital Method ◽  
Positron Impact ◽  
Excitation Cross Sections ◽  
Incident Positron

The excitation cross-sections of the 2S state of atomic hydrogen at low (near threshold energy) to high incident positron energies (10.30 to 300 eV) have been calculated using the variational polarized-orbital method. Nine partial waves have been used to obtain converged cross-sections in the above energy range. The cross sections compared to the electron-impact excitation of the S state of atomic hydrogen are larger in the present case. The maximum cross section is 3.63(−1) π a 0 2 at 16.5 eV compared to 1.37(−1) π a 0 2 at 11.14 eV for the electron-impact excitation. The present results are compared with other calculations. Cross-sections have also been calculated in the Born approximation in which the polarization of the target has been included. Differential cross sections were calculated at k = 1.0 (13.6eV), 2.5 (85 eV), 3.483 (200 3V), and 4.696 (300 eV).

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
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