Angular correlation parameters for the electron impact excitation of the 21 P and 31 P states of helium using first-order many-body theory

1988 ◽  
Vol 8 (3) ◽  
pp. 219-228 ◽  
Author(s):  
G. D. Meneses ◽  
G. Csanak
Keyword(s):  
Electron Impact ◽  
Angular Correlation ◽  
Impact Excitation ◽  
Electron Impact Excitation ◽  
Many Body ◽  
First Order ◽  
Many Body Theory ◽  
Correlation Parameters ◽  
Body Theory

Excitation from metastable 23S states of helium by electrons and positrons

1996 ◽  
Vol 74 (7-8) ◽  
pp. 521-526 ◽  
Author(s):  
Surbhi Verma ◽  
Rajesh Srivastava
Keyword(s):  
Electron Impact ◽  
Cross Sections ◽  
Impact Excitation ◽  
Electron Impact Excitation ◽  
Many Body ◽  
Many Body Theory ◽  
Electrons And Positrons ◽  
Body Theory ◽  
Orientation Parameters ◽  
Approximation Calculation

Our recent distorted-wave approximation calculation for the electron-impact excitation cross sections of the helium atom from its 23S state to upper states was extended to obtain alignment and orientation parameters for n3P (n = 2, 3, 4) excitations. Further, similar results are obtained by considering the excitation by impact of positrons. The calculated alignment and orientation results are compared with the only available theoretical electron-impact results obtained using first-order many-body theory.

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