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MO: Fachverband Molekülphysik
MO 7: Collisions, Scattering and Correlation Phenomena II (joint session A/MO)
MO 7.4: Vortrag
Montag, 2. März 2026, 17:45–18:00, N 2
Detachment with target ionization in collisions of slow D- ions with He and Ar — •Michael Schulz1, Felix Hermann1, Weiyu Zhang1, Alexander Voitkiv2, Bennaceur Najjari3, Maka Siddiki1, Alexander Dorn1, Manfred Grieser1, Florian Grussie1, Holger Kreckel1, Olda Novotny1, Andreas Wolf1, Thomas Pfeifer1, Claus Dieter Schröter1, and Robert Moshammer1 — 1Max Planck Institut für Kernphysik, Heidelberg, Germany — 2Heinrich Heine University, Düsseldorf, Germany — 3Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, China
We have measured momentum-analyzed recoil-ions and ejected electrons in triple coincidence with projectiles neutralized in collisions of D- ions with He and Ar at projectile energies between 20 and 120 keV. From the data we extracted multiple-differential momentum distributions of electrons ejected in detachment accompanied by single target ionization. For the Ar target the results confirm a strong role played by a first-order correlated channel proceeding by a mutual interaction between the active projectile- and target- electrons which we observed earlier for Si- projectiles. Surprisingly, this is the case even well below the threshold energy for this mechanism pointing to the significance of the interaction between the two active electrons in this fundamental scattering process. The first-order process is important for the He target as well, however, there signatures of higher-order channels are more pronounced than for Ar. The data are qualitatively well reproduced by our higher-order calculations.
Keywords: Detachment; Ionization; ReMi; Cryogenic storage ring; Anions