scholarly journals Few Body Effects in the Electron and Positron Impact Ionization of Atoms

Atoms ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 33
Author(s):  
R.I. Campeanu ◽  
Colm T. Whelan

Triple differential cross sections (TDCS) are presented for the electron and positron impact ionization of inert gas atoms in a range of energy sharing geometries where a number of significant few body effects compete to define the shape of the TDCS. Using both positrons and electrons as projectiles has opened up the possibility of performing complementary studies which could effectively isolate competing interactions that cannot be separately detected in an experiment with a single projectile. Results will be presented in kinematics where the electron impact ionization appears to be well understood and using the same kinematics positron cross sections will be presented. The kinematics are then varied in order to focus on the role of distortion, post collision interaction (pci), and interference effects.

1987 ◽  
Vol 65 (5) ◽  
pp. 458-461 ◽  
Author(s):  
Sushma Saxena ◽  
M. K. Srivastava

Triple differential cross sections for the positron-impact ionization of hydrogen and helium in a coplanar, asymmetric geometry are calculated by using the second Born and the modified Glauber approximations. The present results are compared with those for the corresponding electron-impact case. The positron gives a larger binary- to recoil-peak maxima ratio than the electron.


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