Berlin 2001 – wissenschaftliches Programm
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A: Atomphysik
A 12: Posters Thursday (Ion/Atom/Molecule/Surface Scattering)
A 12.40: Poster
Donnerstag, 5. April 2001, 12:30–15:00, AT3
Interference effects in electron emission from H2 by 60.5 MeV/u Kr34+ impact — •Nikolaus Stolterfoht1, Volker Hoffmann1, Bengt Skogvall1, Bela Sulik2, Jean-Yves Chesnel3, Jimmy Rangama3, Francois F. Frémont3, Dominique Hennecart3, Amin Cassimi3, Xavier Husson3, Allan Landers4, John Tanis4, Roberto Rivarola5, and 6 — 1Hahn-Meitner-Institut Berlin GmbH, D-14109 Berlin,Germany — 2Institute of Nuclear Research (ATOMKI), H-4001 Debrecen,Hungary — 3Centre Interdisciplinaire de Recherche Ions Lasers, F-14050 Caen cedex 04, France — 4Western Michigan University Kalamazoo, Michigan 49008,USA — 5Instituto de Fisica Rosario, Conicet-UNR, 2000 Rosario, Argentina — 6
Electron emission in the electron energy range from 2−300 eV was measured for 60.5 MeV/u Kr34+ ions impacting on H2 at the GANIL accelerator facility in Caen, France. We anticipated that electron emission from H2 may exhibit interference phenomena similar as in Young’s two-slit experiment. The high projectile velocity of ∼ 40 a. u. is advantageous, since the time difference in striking the two hydrogen centers of the H2 molecule is negligible and, thus, the coherence of electron emission from the two centers is enhanced. Model calculations were introduced to guide the search for interference effects in the electron spectra produced by coherent electron emission from the two identical H atoms. In the experiments a full sinusoidal-like oscillation was observed within the electron energy range up to 250 eV in good agreement with the calculations. For future experiments we point out that the interference pattern can be used to obtain direct information about the separation of the atoms in the molecular target.