scholarly journals Schwinger Variational Calculation for Ionisation of Hydrogen Atoms by Electrons

1994 ◽  
Vol 47 (6) ◽  
pp. 751 ◽  
Author(s):  
JN Das ◽  
A Dey ◽  
K Chakrabarti
Keyword(s):  
Variational Principle ◽  
Differential Cross Section ◽  
Cross Section ◽  
Differential Cross ◽  
Variational Calculation ◽  
Hydrogen Atoms ◽  
Triple Differential Cross Section ◽  
High Energies ◽  
Schwinger Variational Principle

The Schwinger variational principle has been used to calculate the triple differential cross section for ionisation of hydrogen atoms by electrons at intermediate and high energies for Ehrhardt-type asymmetric geometry. The results are somewhat better in the recoil peak regions compared with those of the second Born and other similarly successful calcula

scholarly journals Electron Impact Ionisation of Metastable 2s-state Hydrogen Atoms

1996 ◽  
Vol 49 (5) ◽  
pp. 937 ◽  
Author(s):  
Sunil Dhar
Keyword(s):  
Experimental Study ◽  
Differential Cross Section ◽  
Electron Impact ◽  
Cross Section ◽  
Differential Cross ◽  
Scattering Theory ◽  
Present Calculation ◽  
Hydrogen Atoms ◽  
Triple Differential Cross Section ◽  
Impact Ionisation

The triple differential cross section for ionisation of hydrogen atoms in the metastable 2s-state by electrons of 250 eV incidence energy has been calculated following the multiple scattering theory of Das and Seal (1993). The results are compared with the first Born results and with the results of some other theories. Additional features are noted in the cross section curves of the present calculation. These offer wider scope for the experimental study of ionisation of hydrogen atoms in their metastable states.

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