Positron impact ionization of hydrogen and the noble gases

2001 ◽  
Vol 79 (10) ◽  
pp. 1231-1236 ◽  
Author(s):  
R I Campeanu ◽  
R P McEachran ◽  
A D Stauffer
Keyword(s):  
Molecular Hydrogen ◽  
Noble Gases ◽  
Impact Ionization ◽  
Wave Model ◽  
Previous Experience ◽  
Distorted Wave ◽  
Positron Impact ◽  
Single Method

Based on our previous experience with positron ionization, we propose a simple distorted-wave model for this process and apply it to the ionization of atomic and molecular hydrogen as well as the noble gases. The advantage of having a single method that produces reliable results in all cases is discussed. PACS No.: 34.85+x

Positron-impact ionization of helium in the distorted-wave polarized-orbital method

1989 ◽  
Vol 39 (4) ◽  
pp. 1756-1759 ◽  
Author(s):  
K. K. Mukherjee ◽  
P. S. Mazumdar ◽  
S. Brajamani
Keyword(s):  
Impact Ionization ◽  
Orbital Method ◽  
Distorted Wave ◽  
Positron Impact

Positron impact ionization of krypton and xenon

2000 ◽  
Vol 77 (10) ◽  
pp. 769-774 ◽  
Author(s):  
R I Campeanu ◽  
R P McEachran ◽  
A D Stauffer
Keyword(s):  
Energy Range ◽  
Cross Sections ◽  
Free Electron ◽  
Impact Ionization ◽  
Plane Waves ◽  
Distorted Wave ◽  
Positron Impact ◽  
Full Energy ◽  
Alternate Model ◽  
Wave Models

Several distorted-wave models for positron ionization of krypton and xenon are investigated. Our previous CPE (Coulomb plus Plane waves -- full Energy range) model produces reliable cross sections for krypton. For xenon, at high positron energies, the CPE results fall below experiment. We have proposed an alternate model DCPE4 that works well for both krypton and xenon. A common feature of both of these models is that the free electron and positron are treated differently.PACS No.: 34.90.+q

The effect of target representation in positron-impact ionization of molecular hydrogen

2003 ◽  
Vol 310 (5-6) ◽  
pp. 445-450 ◽  
Author(s):  
R.I Campeanu ◽  
V Chis ◽  
L Nagy ◽  
A.D Stauffer
Keyword(s):  
Molecular Hydrogen ◽  
Impact Ionization ◽  
Positron Impact

Distorted wave calculation of the electron impact ionization cross section of the ground state of atomic hydrogen

1996 ◽  
Vol 74 (5-6) ◽  
pp. 226-229 ◽  
Author(s):  
Th. Subodh Chandra Singh ◽  
N. Ranjit Singh ◽  
N. C. Deb ◽  
S. C. Mukherjee ◽  
M. Babuyaima ◽  
...  
Keyword(s):  
Electron Impact ◽  
Cross Section ◽  
Ground State ◽  
Atomic Hydrogen ◽  
Impact Ionization ◽  
Wave Model ◽  
Electron Impact Ionization ◽  
Incident Electron Energy ◽  
Distorted Wave ◽  
Wave Calculation

The total cross section and single differential cross section in energy for the electron impact ionization of the ground state of atomic hydrogen were computed using a distorted wave model. The incident electron energy range was 20–250 eV. The present results are compared with existing theoretical and experimental results.

Positron-impact ionization of hydrogen atoms

1985 ◽  
Vol 63 (5) ◽  
pp. 621-624 ◽  
Author(s):  
A. S. Ghosh ◽  
P. S. Majumdar ◽  
Madhumita Basu
Keyword(s):  
Cross Section ◽  
Ionization Cross Section ◽  
Impact Ionization ◽  
Orbital Method ◽  
Distorted Wave ◽  
Positron Impact ◽  
Hydrogen Atoms ◽  
Ionization Cross ◽  
Channel Wave ◽  
Final Channel

The ionization cross section of hydrogen atoms by positron impact has been calculated by using a distorted-wave polarized-orbital method. We have employed two models depending on the choice of the final-channel wave function, and the two sets of results differ dramatically. We have also found that below 100 eV the total positron-impact ionization cross section including positronium formation is appreciably larger than the corresponding results for electron-impact ionization.

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