Selective enhancement of 1s2s2p PJ4 metastable states populated by cascades in single-electron transfer collisions of F7+ (1 s2 1s2s S3) ions with He and H2 targets

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Abstract

A mechanism for the selective population of 1s2s2p PJ4 states by electron capture in energetic collisions of F7+ (1s2s S3) ions with H2 and He is elucidated. Capture calculations indicate (1s2s S3) nl L 2,4 doublet and quartet levels to be approximately evenly populated for n=2-5. Following capture the doublets Auger decay strongly to the 1 s2 ground state allowing for negligible feeding of other lower-lying doublets by radiative transitions. The quartets, however, find this decay channel blocked by spin conservation and instead radiatively cascade through lower lying quartets, eventually strongly populating the lowest-lying 1s2s2p PJ4 levels in agreement with older experimental results for collision energies above 0.7 MeV/u.

Original languageEnglish
Article number050701
JournalPhysical Review A
Volume77
Issue number5
DOIs
Publication statusPublished - May 9 2008

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metastable state
electron transfer
cascades
collisions
augmentation
decay
electron capture
conservation
ions
ground state
energy

ASJC Scopus subject areas

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

Cite this

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title = "Selective enhancement of 1s2s2p PJ4 metastable states populated by cascades in single-electron transfer collisions of F7+ (1 s2 1s2s S3) ions with He and H2 targets",
abstract = "A mechanism for the selective population of 1s2s2p PJ4 states by electron capture in energetic collisions of F7+ (1s2s S3) ions with H2 and He is elucidated. Capture calculations indicate (1s2s S3) nl L 2,4 doublet and quartet levels to be approximately evenly populated for n=2-5. Following capture the doublets Auger decay strongly to the 1 s2 ground state allowing for negligible feeding of other lower-lying doublets by radiative transitions. The quartets, however, find this decay channel blocked by spin conservation and instead radiatively cascade through lower lying quartets, eventually strongly populating the lowest-lying 1s2s2p PJ4 levels in agreement with older experimental results for collision energies above 0.7 MeV/u.",
author = "Zouros, {T. J M} and B. Sulik and L. Guly{\'a}s and K. Tők{\'e}si",
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T1 - Selective enhancement of 1s2s2p PJ4 metastable states populated by cascades in single-electron transfer collisions of F7+ (1 s2 1s2s S3) ions with He and H2 targets

AU - Zouros, T. J M

AU - Sulik, B.

AU - Gulyás, L.

AU - Tőkési, K.

PY - 2008/5/9

Y1 - 2008/5/9

N2 - A mechanism for the selective population of 1s2s2p PJ4 states by electron capture in energetic collisions of F7+ (1s2s S3) ions with H2 and He is elucidated. Capture calculations indicate (1s2s S3) nl L 2,4 doublet and quartet levels to be approximately evenly populated for n=2-5. Following capture the doublets Auger decay strongly to the 1 s2 ground state allowing for negligible feeding of other lower-lying doublets by radiative transitions. The quartets, however, find this decay channel blocked by spin conservation and instead radiatively cascade through lower lying quartets, eventually strongly populating the lowest-lying 1s2s2p PJ4 levels in agreement with older experimental results for collision energies above 0.7 MeV/u.

AB - A mechanism for the selective population of 1s2s2p PJ4 states by electron capture in energetic collisions of F7+ (1s2s S3) ions with H2 and He is elucidated. Capture calculations indicate (1s2s S3) nl L 2,4 doublet and quartet levels to be approximately evenly populated for n=2-5. Following capture the doublets Auger decay strongly to the 1 s2 ground state allowing for negligible feeding of other lower-lying doublets by radiative transitions. The quartets, however, find this decay channel blocked by spin conservation and instead radiatively cascade through lower lying quartets, eventually strongly populating the lowest-lying 1s2s2p PJ4 levels in agreement with older experimental results for collision energies above 0.7 MeV/u.

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