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MO: Fachverband Molekülphysik

MO 20: Poster III

MO 20.14: Poster

Thursday, March 9, 2023, 16:30–19:00, Empore Lichthof

Action Spectroscopic Infrared Detection of NCCO⁺ — •Marcel Bast¹, Thomas Salomon¹, Oskar Asvany¹, Igor Savić², Sandra Brünken³, Mathias Schäfer⁴, Stephan Schlemmer¹, and Sven Thorwirth¹ — ¹I. Physikalisches Institut, Universität zu Köln, Köln, Germany — ²Department of Physics, Faculty of Sciences, University of Novi Sad, Serbia — ³FELIX Laboratory, Institute for Molecules and Materials, Radboud University, Nijmegen, the Netherlands — ⁴Institute of Organic Chemistry, Department of Chemistry, University of Cologne, Köln, Germany

The linear NCCO⁺ ion has been studied spectroscopically for the first time using the Free Electron Laser for Infrared eXperiments (FELIX) in combination with the 4K 22-pole ion trap facility FELion. The vibrational spectrum of NCCO⁺ was observed in the range from 500 to 1400 and 2000 to 2500 cm⁻¹ using resonant photodissociation of the correponding Ne-complex. Spectroscopic assignments are in very good agreement with high-level quantum-chemical calculations.

In a consecutive study, the rotationally resolved ν₂ band of the bare NCCO⁺ ion was measured around 2150 cm⁻¹ using the COLTRAP2 instrument in Cologne. Here, the recently developed action spectroscopic method Leak-Out Spectroscopy (LOS)^a was used, that traces the bare ion rather than a weakly bound complex. In this manner, as will be shown on this poster, a nearly background-free absorption spectrum with a large signal-to-noise ratio was obtained.

^a Schmid et al. 2022, J. Phys. Chem. A 126, 43, 8111-8117