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MO: Fachverband Molekülphysik
MO 27: Molecular Spectroscopy II
MO 27.3: Vortrag
Donnerstag, 5. März 2026, 15:00–15:15, P 204
Low temperature ultraviolet photodissociation spectroscopy of [dAMP-H]− — •Christian Sprenger1, Samuel J. M. White1, Miriam Westermeier1, Gabriel Schöpfer1, Franziska Dahlmann1,3, Uma Namangalam2, Salvi Mohandas2, Sunil Kumar S.2, Eric S. Endres1, and Roland Wester1 — 1Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck, Technikerstraße 25, 6020 Innsbruck, Austria — 2Indian Institute of Science Education and Research Tirupati, Department of Physics, Panguru, Andhra Pradesh, India - 517619 — 3Current address: Department of Chemaical Engineering, KTH Royal Institute of Technology, 100 44 Stockholm, Sweden
To deepen the understanding of photoexcitation of DNA by ultraviolet radiation, we performed a wavelength dependent photoabsorption study of the anionic deprotonated nucleotide [dAMP-H]−. Within the range of our study, between 240 nm and 270 nm, we were able to resolve multiple spectral features, that could not be resolved before. This was made possible by our 16-pole radiofrequency wire trap, which operates at a temperature of 3 K. Furthermore, we analysed the yield of five ionic photofragments as a function of wavelength. Finally we determined the absolute photofragmentation cross section of [dAMP-H]−, by performing a comparative measurement of the I− photodetachment cross section. The results of these photodissociation measurements, published in Ref [1], will be presented.
[1] C. Sprenger et al., J. Phys. Chem. A, (in press)
Keywords: biomolecules; trapped ions; UV spectroscopy