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MO: Fachverband Molekülphysik

MO 6: Electronic Spectroscopy II

MO 6.8: Vortrag

Dienstag, 10. März 2020, 15:45–16:00, f102

Probing the Valence Electronic Structure of Aqueous Diazines Using Resonant X-ray Photoelectron Spectroscopy — •Md Sabbir Ahsan^1,2 and Iain Wilkinson¹ — ¹Methods for Material Development, Helmholtz-Zentrum Berlin, Hahn-Meitner-Platz 1, 14109 Berlin, Germany — ²Department of Physics, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany

Aqueous diazines play important roles in the photophysicochemical properties of bio-molecules such as DNA and RNA. We present liquid microjet based soft x-ray resonant photoelectron spectroscopy (RPES) measurements that probed the valence electronic structure of aqueous diazines. A number of core-valence resonances were identified by RPES scans over the diazine N K-edges and photoelectron spectra were subsequently recorded at different resonances. The solute signal was selectively enhanced in the RPES spectra with respect to solvent contributions. Moreover, by comparing the resonant Auger contributions with the non-resonant Auger signals, participator and spectator features were identified in the photoelectron spectra. Identification of participator peaks allowed us to determine aqueous-phase binding energies (BEs) associated with valence orbitals which are more generally hidden in non-resonant experiments. The associated BE information allowed us to map the valence electronic structure of the aqueous diazines and yielded valuable information for the interpretation of ongoing valence excited state time-resolved liquid-jet photoelectron spectroscopy experiment.