Dresden 2011 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MO: Fachverband Molekülphysik
MO 18: Experimental Techniques and Various Topics
MO 18.3: Vortrag
Mittwoch, 16. März 2011, 17:00–17:15, MER 02
High Resolution X-Ray Emission Spectroscopy of Water and Aqueous Ions using the Micro-Jet Technique — •Kathrin Maria Lange1, René Könnecke1, Samira Ghadimi1, Ronny Golnak1, Mikail Soldatov2, Kai Friedrich Hodeck1, Alexander Soldatov2, and Emad Flear Aziz1,3 — 1Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Str. 15, 12489 Berlin — 2Research Center for Nanoscale Structure of Matter, Southern Federal University, Sorge 5, Rostov-na-Donu 344090, Russia — 3Freie Universität Berlin, FB Physik, Arnimallee 14, D-14195 Berlin
Soft X-ray absorption (XA) and emission (XE) spectroscopy is a powerful method for probing the local electronic structure of light elements (e.g. C, O, N, S) and transition metals, which are all of importance for biochemical systems. Here, we report on the XE spectra of a liquid micro-jet sample in a vacuum environment.1 We developed a high resolution X-ray emission spectrometer and recorded the spectra of pure water in full agreement with those of the literature, as well as of an aqueous solution of NiCl2. For the latter system, ground state Hartree-Fock calculations using a self-consistent reaction field (SCRF) approach were carried out to specify the nature of the d-occupied orbital. Our results confirm the dark-channel-fluorescence-yield mechanism that we recently proposed for the case of metal ions in aqueous solutions. The ability to record absorption and emission spectra of an aqueous liquid-jet opens the way for the study of biochemical systems in physiological media.
1 Lange et al., Chemical Physics 377, 1-5 (2010)