Mainz 2026 – scientific programme

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SYIN: Symposium Interactions with Negatively Charged Molecules

SYIN 1: Symposium Interactions with Negatively Charged Molecules (SYIN)

SYIN 1.3: Invited Talk

Thursday, March 5, 2026, 12:00–12:30, RW 1

Studies of negative ions in a cryogenic storage ring using laser driven state manipulation — •Dag Hanstorp — Department of Physics, University of Gothenburg, SE 412 96 Gothenburg, Sweden

I will in this talk discuss experimental investigations of negative ions at the Double ElectroStatic Ion Ring ExpEriment (DESIREE) in Stockholm. This facility consists of two cryogenic storage rings with a common section where collisions between positive and negative ions can be induced.

I will present measurements of lifetimes of long-lived excited states and high precision measurements of electron affinities. I will further present a study where we in an optically forbidden transition in Sn⁻ managed to resolve both hyperfine structures and isotope shifts. Finally, I will present a study of the mutual neutralization process Si⁻ + Na⁺/K ⁺ → Si + Na/K using a beam of pure ground-state Si⁻ ions. These experiments were all made possible by preparing the stored negative ion beam using laser driven state manipulation.

Keywords: Negative ions; Storage rings; Photodetachment; State manipulation