Direct ionization of heavy noble gases by positron impact

2005 ◽  
Vol 71 (3) ◽  
Author(s):  
K. Bartschat
Keyword(s):  
Noble Gases ◽  
Positron Impact ◽  
Direct Ionization

Single ionization by positron impact

1996 ◽  
Vol 74 (7-8) ◽  
pp. 367-372 ◽  
Author(s):  
J. Moxom ◽  
P. Ashley ◽  
G. Laricchia
Keyword(s):  
Energy Range ◽  
Cross Sections ◽  
Positron Impact ◽  
Ionization Cross ◽  
Positron Scattering ◽  
Direct Ionization ◽  
Low Energies ◽  
Ionization Cross Sections ◽  
Impact Energies ◽  
Existing Data

The single direct ionization cross sections for positron scattering [Formula: see text] on He, Ar, Kr, and H2 were measured and compared with existing data and the corresponding cross sections for electron impact [Formula: see text]. At most impact energies the present data for He and H2 are in reasonable accord with other measurements and, in the case of He, with some of the available calculations. At low energies, [Formula: see text] is found to increase more slowly than [Formula: see text], probably due to the importance of Ps formation in this energy range.

Positron-impact direct ionization of lithium, sodium and potassium atoms

2021 ◽  
Vol 75 (10) ◽  
Author(s):  
R. Utamuratov ◽  
D. V. Fursa ◽  
A. S. Kadyrov ◽  
R. I. Campeanu ◽  
I. Bray ◽  
...  
Keyword(s):  
Positron Impact ◽  
Direct Ionization ◽  
Sodium And Potassium

scholarly journals Binary-Encounter Model for Direct Ionization of Molecules by Positron-Impact

Atoms ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 99
Author(s):  
Małgorzata Franz ◽  
Katarzyna Wiciak-Pawłowska ◽  
Jan Franz
Keyword(s):  
Cross Sections ◽  
Positron Impact ◽  
Standard Quantum ◽  
Direct Ionization ◽  
Wide Range ◽  
Small Set ◽  
The Cross ◽  
Ionization Cross Sections ◽  
Binary Encounter ◽  
Good Agreement

We introduce two models for the computation of direct ionization cross sections by positron impact over a wide range of collision energies. The models are based on the binary-encounter-Bethe model and take into account an extension of the Wannier theory. The cross sections computed with these models show good agreement with experimental data. The extensions improve the agreement between theory and experiment for collision energies between the first ionization threshold and the peak of the cross section. The models are based on a small set of parameters, which can be computed with standard quantum chemistry program packages.

Double ionization of noble gases by positron impact

1999 ◽  
Author(s):  
H. Bluhme ◽  
H. Knudsen ◽  
J. P. Merrison
Keyword(s):  
Noble Gases ◽  
Double Ionization ◽  
Positron Impact

Strong Suppression of the Positronium Channel in Double Ionization of Noble Gases by Positron Impact

1998 ◽  
Vol 81 (1) ◽  
pp. 73-76 ◽  
Author(s):  
H. Bluhme ◽  
H. Knudsen ◽  
J. P. Merrison ◽  
M. R. Poulsen
Keyword(s):  
Noble Gases ◽  
Double Ionization ◽  
Positron Impact ◽  
Strong Suppression

Double ionization of noble gases by positron impact

1999 ◽  
Vol 60 (4) ◽  
pp. 2940-2943 ◽  
Author(s):  
J. Moxom ◽  
D. M. Schrader ◽  
G. Laricchia ◽  
Jun Xu ◽  
L. D. Hulett
Keyword(s):  
Noble Gases ◽  
Double Ionization ◽  
Positron Impact

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

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