Positron impact ionisation of atoms

V. Kara, K. Paludan, J. Moxom, P. Ashley, G. Laricchia

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Experimental data are presented for the single (σi+) and the ratio of double to single (R2) ionisation cross sections for e+ impact on Ne, Kr and Xe from near threshold to 1000 eV. The ratio between e+ and e- σi+ maxima was generally seen to be lower for targets with higher atomic number (Z), as would be expected from the effect of the increasing static interaction between the projectile and undistorted target. For double ionisation, the importance of inner-shell ionisation followed by Auger decay is manifest at high velocities for the higher Z targets. Preliminary measurements of the total ionisation cross section (σΤ+) in e+-D collisions are also presented and are found to disagree with recent results.

Original languageEnglish
Pages (from-to)94-99
Number of pages6
JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume143
Issue number1-2
Publication statusPublished - Aug 2 1998

Fingerprint

Impact ionization
Positrons
Ionization
positrons
ionization cross sections
ionization
Atoms
atoms
projectiles
Projectiles
collisions
thresholds
decay
interactions

Keywords

  • Hydrogen
  • Inert atoms
  • Ionisation
  • Positron
  • Trajectory effects

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Instrumentation
  • Surfaces and Interfaces

Cite this

Positron impact ionisation of atoms. / Kara, V.; Paludan, K.; Moxom, J.; Ashley, P.; Laricchia, G.

In: Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms, Vol. 143, No. 1-2, 02.08.1998, p. 94-99.

Research output: Contribution to journalArticle

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