Measurement of the O$^{-}$ Photodetachment cross-section in the electrostatic storage ring FLSR

Oliver Forstner; Thorben Niemeyer; Andrey I. Bondarev; Markus Dworak; Vadim Gadelshin; Raphael Hasse; Lothar Schmidt; Markus Schöffler; Matou Stemmler; Kurt E. Stiebing; Dominik Studer; Klaus Wendt; Patric Ziel

arXiv · 2608.24359

Measurement of the O$^{-}$ Photodetachment cross-section in the electrostatic storage ring FLSR

Oliver Forstner·Thorben Niemeyer·Andrey I. Bondarev·Markus Dworak·Vadim Gadelshin·Raphael Hasse·Lothar Schmidt·Markus Schöffler·Matou Stemmler·Kurt E. Stiebing·Dominik Studer·Klaus Wendt·Patric Ziel

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Abstract

The achievable precision of photodetachment studies via tunable laser light has been investigated on circulating oxygen anions at the room-temperature electrostatic low-energy storage ring of Frankfurt University (FLSR) in preparation of investigations on molecular species. For this purpose, the FLSR, originally designed for reaction dynamics studies on positive ions, was upgraded by a source for anions, by the installation of a tunable high repetition rate laser system and by implementation of a transversal interaction region between laser and ion beam. Results on the electron affinity and the ground state fine structure of O$^{-}$, which both serve as a calibration standard, are discussed, exhibiting the performance and accuracy of this new spectroscopic application of the FLSR.

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Oliver Forstner, Thorben Niemeyer, Andrey I. Bondarev, Markus Dworak, Vadim Gadelshin, Raphael Hasse, Lothar Schmidt, Markus Schöffler, Matou Stemmler, Kurt E. Stiebing, Dominik Studer, Klaus Wendt, Patric Ziel. 2026-08-25. Measurement of the O$^{-}$ Photodetachment cross-section in the electrostatic storage ring FLSR. https://arxiv.org/abs/2608.24359

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