Erlangen 2022 – scientific programme
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MO: Fachverband Molekülphysik
MO 19: Poster 3
MO 19.1: Poster
Thursday, March 17, 2022, 16:30–18:30, P
High resolution spectroscopy of biomolecules in a cryogenic 16-pole wire ion trap — •Endres Eric1, Geistlinger Katharina1, Dahlmann Franziska1, Michaelsen Tim1, Oncak Milan1, Mohandas Salvi2, and Wester Roland1 — 1Institut f. Ionenphysik und Angewandte Physik, Universität Innsbruck, Austria — 2Institute of Science Education and Research, Tirupati, India
Spectroscopy plays an increasingly important role in the study of structural details of complex biological systems and the investigation of UV photodamage of genetic material. In combination with electrospray ionization, ion trap spectroscopy has been successfully used to investigate electronic and vibrational transitions in biomolecules in order to determine geometrical structures or the decay channels following electronic excitation.
In this contribution a recently developed linear cryogenic 16-pole wire ion trap for ion spectroscopy at temperatures below 4 K will be presented. The trap offers a large field-free region in the radial direction, reducing radio-frequency heating and provides large optical access perpendicular to the ion beam direction.[1] The low temperatures enabled multiple helium tagging of glycine ions, allowing high resolution IR action spectroscopy of the OH stretching vibration. Simulated rotational contours of the absorption band yield a rotational temperature of about 6 K.[2] Furthermore, preliminary results of photodissociation measurement of [dAMP-H]−, a monomer of DNA, will be presented.
[1]Geistlinger et. al., Rev. Sci. Instrum. 92, 023204 (2021)
[2]Geistlinger et. al., J. Mol. Spectrosc. 379, 111479 (2021)