State-selective electron-capture cross section measurements for low-energy collisions of He-like ions on H2

G. Lubinski, Z. Juhász, R. Morgenstern, R. Hoekstra

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

We measured state-selective absolute electron capture cross sections for collisions of He-like C4+, N5+ and O6+ ions with molecular hydrogen by means of photon emission spectroscopy at impact energies ranging from 4 keV amu-1 down to energies as low as 5 eV amu-1. In this low-energy region the total cross sections are found to be weakly dependent on the projectile energy, whereas the state-selective ones change drastically with varying impact energy. Up to now no experiments were available to benchmark theoretical predictions. In our method we combine for the first time decelerated projectile beams with the possibility of measuring state-selective electron capture. Compared with existing measurements for state-selective cross sections our deduced cross sections are in perfect agreement in the overlapping energy region (E≫100 eV amu-1). Good agreement is also found on comparing our results with existing total cross sections. In comparison with theoretical calculations some remarkable and unexpectedly large discrepancies of orders of magnitude are found towards lower impact energies.

Original languageEnglish
Pages (from-to)5275-5296
Number of pages22
JournalJournal of Physics B: Atomic, Molecular and Optical Physics
Volume33
Issue number23
DOIs
Publication statusPublished - Dec 14 2000

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electron capture
absorption cross sections
collisions
ions
cross sections
energy
projectiles
photons
hydrogen
predictions
spectroscopy

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Physics and Astronomy(all)

Cite this

State-selective electron-capture cross section measurements for low-energy collisions of He-like ions on H2 . / Lubinski, G.; Juhász, Z.; Morgenstern, R.; Hoekstra, R.

In: Journal of Physics B: Atomic, Molecular and Optical Physics, Vol. 33, No. 23, 14.12.2000, p. 5275-5296.

Research output: Contribution to journalArticle

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