Evidence for interference effects in both slow and fast electron emission from D2 by energetic electron impact

Omar Kamalou (1) , Jean-Yves Chesnel (1) , David Martina (1) , Jocelyn Hanssen (2) , Carlos R. Stia (3) , Omar A. Fojón (3) , Roberto D. Rivarola (3) , François Frémont (1)

1 CIMAP - UMR 6252 - Centre de recherche sur les Ions, les MAtériaux et la Photonique
2 LPMC - Laboratoire de physique moléculaire et des collisions
3 IFIR - Instituto de Física de Rosario [Santa Fe]

Interference patterns due to the coherent electron emission from the atomic centers of a D2 molecule by fast electron impact are experimentally observed in doubly differential cross sections. This behavior is supported by theoretical predictions. Measurements are given for the impact of 2.4 keV electrons. The emitted electrons are detected in the energy range from 2 to 2000 eV, at observation angles between 30° and 130°. In addition to the interference phenomenon in electron emission following soft collisions, it is shown that interference effects appear for ejected electron energies corresponding to the binary-encounter mechanism.

Mots clés: Ionization; Electron emission; Coherent electron emission; Electron interference; Young-type interference; Electron-molecule collisions; Fast electron-molecule collisions; Electron spectroscopy; Energy distribution; Soft many-body processes; Binary-encounter process

Domaines: Physique Atomique [physics.atom-ph]; Agrégats Moléculaires et Atomiques [physics.atm-clus]; Chimie-Physique [physics.chem-ph]

Omar Kamalou, Jean-Yves Chesnel, David Martina, Jocelyn Hanssen, Carlos R. Stia, et al.. Evidence for interference effects in both slow and fast electron emission from D2 by energetic electron impact. Physical Review A : Atomic, molecular, and optical physics [1990-2015], 2005, 71 (1), pp.010702(R). ⟨10.1103/PhysRevA.71.010702⟩. ⟨hal-01218907⟩