Freiburg 2024 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 7: Poster: Spectroscopy
MO 7.2: Poster
Dienstag, 12. März 2024, 17:00–19:00, Tent C
An experimental setup to study the influence of hydration on small charged molecular systems by rotationally resolved vibrational spectroscopy — •Eric Endres1, Christian Sprenger1, Franziska Dahlmann2, and Roland Wester1 — 1Institut f. Ionenphysik und Angewandte Physik, Universität Innsbruck, Technikerstraße 25/3, A-6020 Innsbruck, Austria — 2KTH Royal Institute of Technology, Stockholm, Sweden
Hydration with individual water molecules significantly influences the structure and, consequently, the function of biomolecules. This contribution introduces an experimental setup designed to examine the influence of hydration on the structure of small biomolecules using rotationally resolved pre-dissociation spectroscopy.
Ions are generated using a custom-built Nano-ESI system housed within a controlled environment, regulating e.g. humidity and temperature, enabling the control of the hydration level. A double skimmer setup gently transfer the ions into vacuum, avoiding breaking apart the loosely bound water molecules. Through an octupole guide and a quadrupole guide the water clusters are let into a cryogenic 16-pole wire ion trap. Trap temperatures below 3 K can be achieved, enabled binding of up to four helium atoms on protonated glycine ions. The confined ions are irradiated by a narrow-band laser system with an output linewidth in the IR below 0.1 cm−1
The low temperatures in combination with the small linewidth of the laser system potentially lead to rotationally resolved vibrational spectroscopy. Here the current status will be reported.
Keywords: Spectroscopy; Electrospray ionisation; Biomolecules