SAMOP 2023 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 21: Molecular Physics with X-rays
MO 21.1: Vortrag
Freitag, 10. März 2023, 11:00–11:15, F102
X-ray induced luminescence for DNA molecules in aqueous solution via nitrogen core ionization — •Yusaku Terao1, Yoshiaki Kumagai1, Issei Suzuki1, Takahiro Tsuchiya1, Masatoshi Ukai1, Akinari Yokoya2, Kentaro Fujii2, Yoshihiro Fukuda3, and Yuji Saitoh4 — 1Dept. of Applied Physics, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588, Japan — 2Institute for Quantum Life Science, Naka-gun, 319-1195, Ibaraki, Japan — 3SPring-8 Service Co. Ltd., Tatsuno-shi, Hyogo 679-5165, Japan — 4Synchrotron Radiation Research Center, Hyogo 679-5148, Japan
Radiation effect to biological matter can lead to various kinds of damages on a molecular level. However, a protective environmental effect of surrounding water is expected to play an important role to suppress damage inductions. To get to know about the protective environmental effect, we studied intermediate species along the reaction pathway of core ionized DNA molecules in aqueous solution. We conducted X-ray induced luminescence spectroscopy for nucleotides in aqueous solution using monochromatic soft X-rays in the nitrogen K-shell region at SPring-8 BL23SU. We obtained the excitation spectra of total luminescence yields for four nucleotides samples and the filtered luminescence spectra as well. Those results indicated the luminescence from parent base species which are maintained even after the Auger ionization of core-hole state, implying significant emission processes of their excess charge and energy can take place in the relaxation pathway.