Articles written in Pramana – Journal of Physics
Volume 45 Issue 1 July 1995 pp 41-46
Schwinger variational principle has been used to calculate triple differential cross-sections for ionization of hydrogen atoms by positrons at intermediate and high energies for Ehrhardt type asymmetric geometry. The results agree in general with the calculations of Brauner
Volume 47 Issue 3 September 1996 pp 249-253
A hyperspherical partial wave method of Das to calculate cross sections for ionization of hydrogen atoms by electrons has been applied for low energies. Here effect of coupling among different partial waves is neglected.
Volume 56 Issue 4 April 2001 pp 545-550 Research Articles
Low energy positron impact ionization of atomic hydrogen is studies theoretically using the hyperspherical partial wave method of Das  in constant Θ12, equal energy sharing geometry. The TDCS reveal considerable differences in physics compared to electron impact ionization under the same geometry.
Volume 58 Issue 3 March 2002 pp 529-536 Research Articles
Schwinger variational principle is used here to study large momentum transfer cases of electron and positron impact ionization of atomic hydrogen from the ground state at intermediate and moderately high energies. The results appear somewhat better compared to other theories.
Volume 94, 2020
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