Zobrazeno 1 - 10
of 47
pro vyhledávání: '"Radu I. Campeanu"'
Publikováno v:
Atoms, Vol 12, Iss 8, p 38 (2024)
We review our group’s most significant results concerning the collision of positrons and electrons with small molecules. Total and triple differential cross sections for the ionization of these targets were calculated in the distorted wave Born app
Externí odkaz:
https://doaj.org/article/cc45a457b7634d8b98dcf725d05af4c3
Autor:
Alisher Kadyrov, Igor Bray, Radu I. Campeanu, Robert McEachran, Ravshanbek Utamuratov, Dmitry V. Fursa
Publikováno v:
The European Physical Journal D. 75
The distorted-wave and convergent close-coupling approaches are applied to positron-impact direct ionization of Li, Na and K. We find reasonable agreement between different theoretical approaches at higher energies; however, some significant discrepa
Autor:
Radu I. Campeanu, Colm T. Whelan
Publikováno v:
Atoms
Volume 9
Issue 2
Atoms, Vol 9, Iss 33, p 33 (2021)
Volume 9
Issue 2
Atoms, Vol 9, Iss 33, p 33 (2021)
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.
Publikováno v:
Physical Review A. 97
Triple-differential cross sections (TDCS) are presented for the electron and positron impact ionization of inert gas atoms in a range of geometries where a number of significant few body effects compete to define the shape of the TDCS. Using both pos
Autor:
Radu I. Campeanu
Publikováno v:
The European Physical Journal D. 71
The ionization of the 3p orbital of argon by 100 eV incident electrons and positrons is studied with the DWBA-WM approximation. The variation of our double differential ionization cross sections with the angles of the ejected electrons is found to be
Publikováno v:
The European Physical Journal D. 70
Triple differential cross sections are calculated for the ionization of NH3 by positron impact in coplanar and perpendicular geometrical arrangements. The cross sections are determined for symmetrically emerging particles with equal energies. The pos
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 267:362-365
Theoretical DWBA (distorted-wave Born approximation) cross sections for the ionization of several molecules by positron and electron impact are compared. In this work we study the effect of the projectile charge sign on the ionization cross sections
Autor:
Radu I. Campeanu
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 267:239-243
This paper presents the level of agreement between theory and experiment for positron-impact ionization of atoms and molecules. Distorted-wave theoretical models are able to reproduce the experimental integrated cross sections for atoms and diatomic
Publikováno v:
The European Physical Journal D. 48:351-354
Cross sections for the ionization of N2, CO and O2 diatomic molecules by electron impact are calculated. The applied distorted wave model is based on our previous studies for positron impact, the molecular orbitals being described by Gaussian wavefun
Autor:
Á. Benedek, Radu I. Campeanu
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 266:458-461
A molecular three-continuum approximation is applied for positron-impact ionization of H2. A comparison of the electron and positron-impact TDCS allows for a discussion of the ionization dynamics.