Contribution of the H(n = 3) + e- detachment channel in H-/rare gas collisions

F. Penent, J. L. Montmagnon, J. P. Grouard, D. Modeley, L. Sarkadi

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We present here first results on the coincident detection of 0° electrons with Balmer α photons produced in H-/rare gas (Ar and Ne) collisions at 5 keV. One of the goals was to observe possible excitation and decay of H- shape resonances lying above the H(n = 3) threshold that have been predicted recently. It is still not possible to confirm the presence or not of such resonances, however the obtained electron spectrum has a pronounced cusp shape. A cusp in these collisions can only be produced by dipolar interaction between the detached electron and the H(n = 3) atom due to the permanent electric dipole momentum induced by linear Stark effect in the excited hydrogen atom by the field of the slow outgoing electron. In a previous experiment for H(n = 2) we have observed the dipolar cusp, but in this case it is strongly affected by the presence of the 1P° shape resonance lying above the H(n = 2) threshold by 20 meV. At the H(n = 3) threshold the resonant channel seems to have negligible contribution to the electron spectrum, therefore the dipolar cusp appears clearly.

Original languageEnglish
Pages (from-to)214-219
Number of pages6
JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Issue number1-4
Publication statusPublished - Jun 3 1999
EventProceedings of the 1998 7th Workshop on Fast Ion-Atom Collisions - Debrecen, Hung
Duration: Sep 9 1998Sep 11 1998


ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

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