IAFE   05512
INSTITUTO DE ASTRONOMIA Y FISICA DEL ESPACIO
Unidad Ejecutora - UE
artículos
Título:
Antiproton, proton and electron impact multiple ionization of rare gases,
Autor/es:
C. C. MONTANARI; J. E. MIRAGLIA
Revista:
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
Editorial:
IOP PUBLISHING LTD
Referencias:
Lugar: Londres; Año: 2012 vol. 45 p. 105201 - 105210
ISSN:
0953-4075
Resumen:
We present a study on multiple ionization of Ne, Ar, Kr and Xe by antiproton, proton and
electron impact. Four different aspects are involved in this work. First, the theoretical
calculations of ionization probabilities by impact of antiprotons and protons, in an extended
energy region (25 keV to 10 MeV), using the continuum distorted-wave eikonal initial state
approximation and the first Born approximation. Second, the inclusion of Auger-type
post-collisional contributions through experimental photoionization branching ratios. These
contributions to multiple ionization are very important in the high-energy region. Third, the
comparison with the available experimental data on multiple ionization by protons and
antiprotons in the extended energy range, and by electrons for high-impact velocities, where
proton, antiproton and electron impact results are expected to converge. It is also the energy
region where direct ionization does not explain the experimental results, and the
post-collisional ionization is the main contribution to multiple ionization. And fourth, total
ionization cross sections are calculated and compared with the antiproton, proton and electron
experimental data, showing the importance of Auger-type multiple ionization for heavy targets
even at the level of total cross sections. Gross and count cross sections are scrutinized.