Electron and positron impact single ionization TDCS of argon atoms in the second Born approximation

2021 ◽  
Vol 487 ◽  
pp. 52-60
Author(s):  
G. Purohit
Keyword(s):  
Born Approximation ◽  
Positron Impact ◽  
Single Ionization

Multiple ionization of argon by positron impact

1996 ◽  
Vol 74 (7-8) ◽  
pp. 373-375 ◽  
Author(s):  
R. Hippler ◽  
S. Helms ◽  
U. Brinkmann ◽  
J. Deiwiks ◽  
H. Schneider ◽  
...  
Keyword(s):  
Electron Impact ◽  
Cross Sections ◽  
Experimental Results ◽  
Positronium Formation ◽  
Positron Impact ◽  
Single Ionization ◽  
Multiple Ionization

Recent experimental results for the multiple ionization of argon by positron impact have been reanalysed. Absolute cross sections for the double and triple ionization of argon were obtained from measured ratios of double-to-single and triple-to-single ionization, using known cross sections for single ionization and for positronium formation. Distinct differences compared to similar results for electron impact are noted.

scholarly journals Positron Impact Excitation of the nS States of Atomic Hydrogen

Atoms ◽  
2020 ◽  
Vol 8 (1) ◽  
pp. 9 ◽  
Author(s):  
Anand K. Bhatia
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Born Approximation ◽  
Atomic Hydrogen ◽  
Impact Excitation ◽  
Orbital Method ◽  
Positron Impact ◽  
Excitation Cross Sections ◽  
Theoretical Results ◽  
Incident Positron

The excitation cross sections of the nS states, n = 2 to 6, of atomic hydrogen at various incident positron energies (10.23 to 300 eV) were calculated using the variational polarized-orbital method. Nine partial waves were used to obtain converged cross sections. The present results should be useful for comparison with results obtained from other theories and approximations. The positron-impact cross section was found to be higher than the electron-impact cross sections. Experimental and other theoretical results are discussed. The threshold law of excitation is discussed and the cross sections in this region were seen to obey the threshold law proportional to ( ln k f ) − 2 . Cross sections were calculated in the Born approximation also and compared to those obtained using the variational polarized orbital method.

Positron-impact single ionization of helium using the Faddeev–Merkuriev equations

2020 ◽  
Vol 95 (4) ◽  
pp. 045401
Author(s):  
M Silenou Mengoue ◽  
D E Bokwa Ngombo ◽  
Arnaud Denabe
Keyword(s):  
Positron Impact ◽  
Single Ionization

Single ionization of H2, He, Ne and Ar by positron impact

1990 ◽  
Vol 23 (21) ◽  
pp. 3955-3976 ◽  
Author(s):  
H Knudsen ◽  
L Brun-Nielsen ◽  
M Charlton ◽  
M R Poulsen
Keyword(s):  
Positron Impact ◽  
Single Ionization
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