Mainz 2026 – wissenschaftliches Programm

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SYIN: Symposium Interactions with Negatively Charged Molecules

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

SYIN 1.2: Hauptvortrag

Donnerstag, 5. März 2026, 11:30–12:00, RW 1

Leak-out spectroscopy in cryogenic ion traps — •Stephan Schlemmer, Oskar Asvany, Sven Thorwirth, Philipp Schmid, Weslley Silva, and Thomas Salomon — I. Physikalisches Institut, Universität zu Köln

Action spectroscopy in ion traps is a rather mature field of molecular spectroscopy with infrared multiple photon dissociation (IRMPD) being the most widely spread technique. A relatively new method is leak-out spectroscopy (LOS, [1]), where mass selected ions are stored in a cryogenic trap. Upon internal excitation these ions undergo collisions with a buffer gas which convert this energy partially into kinetic energy such that the ions can leave the trap and be counted in a detector. We will demonstrate the method and present example rotational, vibrational and electronic spectra of selected molecular ions. Some of these spectra are used to find those molecules in space based on astronomical observations. Recent advances of LOS will be discussed.
References: [1] P. C. Schmid, O. Asvany, T. Salomon, S. Thorwirth, and S. Schlemmer, J. Phys. Chem. A, 126, 8111-8117 (2022)