Fivefold differential cross sections for the ionization of aligned hydrogen molecule by electron and positron impact

2012 ◽  
Vol 271 ◽  
pp. 82-91 ◽  
Author(s):  
R. Dey ◽  
A.C. Roy ◽  
C. Dal Cappello
Keyword(s):  
Cross Sections ◽  
Differential Cross ◽  
Hydrogen Molecule ◽  
Differential Cross Sections ◽  
Positron Impact

Relativistic elastic scattering of hydrogen atom by positron impact in a circularly polarized laser field

2013 ◽  
Vol 91 (9) ◽  
pp. 696-702 ◽  
Author(s):  
B. Manaut ◽  
S. Taj ◽  
M. El Idrissi
Keyword(s):  
New York ◽  
Elastic Scattering ◽  
Hydrogen Atom ◽  
Cross Sections ◽  
Differential Cross ◽  
Quantum Electrodynamics ◽  
Laser Field ◽  
Differential Cross Sections ◽  
Positron Impact ◽  
Circularly Polarized

In the framework of the first Born approximation and using the Dirac–Volkov formalism, we investigate the relativistic model describing the laser assisted elastic differential cross sections (DCSs) for positron scattering by the hydrogen atom. Both the DCSs for electron and positron are notably modified by the circularly polarized laser field, particularly in the regime of high energies and medium intensities. Comparing the two numerical DCSs, we recover the well-known result that the elastic scattering differential cross sections with and without laser field for a hydrogen atom by electron and positron impact are the same (Greiner and Reinhardt. Quantum Electrodynamics, 2nd ed., Springer Verlag, New York, Berlin, Heidelberg. 1994). The numerical results reveal that the differential cross section for positron – hydrogen atom scattering is significantly reduced with the increase of the electric field strength.

Triple differential cross sections for the positron-impact ionization of hydrogen and helium

1987 ◽  
Vol 65 (5) ◽  
pp. 458-461 ◽  
Author(s):  
Sushma Saxena ◽  
M. K. Srivastava
Keyword(s):  
Electron Impact ◽  
Cross Sections ◽  
Differential Cross ◽  
Impact Ionization ◽  
Differential Cross Sections ◽  
Positron Impact

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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