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MO: Fachverband Molekülphysik
MO 27: Poster – Collisions, Scattering and Correlation Phenomena (joint session A/MO)
MO 27.3: Poster
Donnerstag, 13. März 2025, 17:00–19:00, Tent
About Ion-neutral coincidence measurements on O2-O2+ collisions using the Trap-REMI — •Henri Lurtz — Max Planck Institute of Nuclear Physics, Heidelberg, Germany
We present the study of ion-neutral collisions involving molecular oxygen (O2+ - O2) using the Trap-REMI setup. This apparatus integrates reaction microscopy (REMI) with electrostatic ion beam trapping, enabling coincidence measurements between stored ion species and a neutral gas jet. We report on the optimization of ion trap simulations, experimental setup refinements, and the characterization of a new electron cyclotron resonance (ECR) ion source. Additionally, we analyzed ion bunch dynamics, mass spectrometry of collision products, and velocity distributions from coincidence measurements. The results primarily indicate an electron capture process, transferring an electron from the neutral molecule to the ion. Furthermore, a novel bunch-splitting mechanism was observed at extended trapping times, attributed to the high space charge ratio within the ion bunch. These findings contribute valuable insights into ion-neutral collision dynamics and have implications for understanding molecular oxygen processes in astrophysics and atmospheric physics.
Keywords: collision; coincidence measurement; Reaction microscope; Charge exchange; oxygen anions