Production of 1s2s2p4P states by transfer-loss cascades in O5+ collisions with He and H2 targets

T. J M Zouros, B. Sulik, L. Gulyás, A. Orbán

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Single differential cross-sections for transfer-loss (TL) leading to the production of O5+ (1s2s 3S)nl 4L states were computed for 0.2-1.2 MeV/u collisions of O5+(1s22s) ions with He and H2 targets. At these collision energies, 1s loss is significant and electron transfer to n = 3 - 4 levels is dominant. Furthermore, due to spin conservation, quartet states can only be populated by TL.Within the independent particle model (IPM), the probability of 1s electron loss from O5+(1s22s) projectiles was calculated using the semi-classical approach, while the probability for electron transfer to the O5+(1s2s 3S)nl 4L states (n ≥ 2) was computed using the continuum distorted wave (CDW) approximation. The majority of states with n > 2 can be assumed to have sufficient time to eventually decay with an almost 100% probability to the long-living metastable 1s2s2p 4P level via a much faster sequence of electric dipole transitions, thus establishing an upper limit to such cascade contributions. The inclusion of this cascade feeding is found to lead to a strong enhancement in the production of the 1s2s2p 4P states, particularly for collisions with the H 2 target, thus reducing dramatically the existing two-order of magnitude discrepancy between older TL calculations (for n = 2 only) and existing zero-degree Auger projectile electron spectroscopy measurements.

Original languageEnglish
Pages (from-to)505-508
Number of pages4
JournalBrazilian Journal of Physics
Volume36
Issue number2 B
Publication statusPublished - Jun 2006

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cascades
collisions
projectiles
electron transfer
electric dipoles
electron spectroscopy
conservation
inclusions
continuums
augmentation
cross sections
decay
approximation
ions
electrons
energy

Keywords

  • Cascade feeding
  • Electron capture
  • Ion-atom collisions
  • Metastable states

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Production of 1s2s2p4P states by transfer-loss cascades in O5+ collisions with He and H2 targets. / Zouros, T. J M; Sulik, B.; Gulyás, L.; Orbán, A.

In: Brazilian Journal of Physics, Vol. 36, No. 2 B, 06.2006, p. 505-508.

Research output: Contribution to journalArticle

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