Berlin 2014 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 20: Electronic Spectroscopy 2

MO 20.4: Vortrag

Donnerstag, 20. März 2014, 17:15–17:30, BEBEL SR144

Ultrafast dynamics of solvated electrons in NaI aqueous solution — •Alexander Kothe, Nicholas Engel, Alexandre Moguilevski, Martin Wilke, Igor Yu. Kiyan, and Emad F. Aziz — Joint Ultrafast Dynamics Lab in Solutions and at Interfaces (JULiq), Helmholtz-Zentrum Berlin für Materialien und Energie (HZB), Albert-Einstein-Str. 15, 12489 Berlin, and Freie Universität Berlin, FB Physik, Arnimallee 14, 14195 Berlin, Germany

Due to the importance of water in physics, chemistry and biology the solvated electron has drawn a lot of scientific interest since its discovery [1]. In our pump-probe experiment we generated solvated electrons in a liquid microjet with 20 mM NaI aqueous solution using laser pulses with a wavelength of 266 nm. The system was probed via photoemission spectroscopy with pulses of 350 nm wavelength. We observed the so called "hot" solvated electrons [2] and an additional excited state with a binding energy of 1.6 eV and a lifetime of approximately 4 ps.

Furthermore, rotating the pump beam and thus orienting the excited state with respect to the probe beam and the spectrometer axis revealed polarization dependence of the "hot" solvated electrons. In contrast to this finding, the excited state with the binding energy of 1.6 eV did not depend on its orientation.

[1] E. J. Hart and J. W. Boag, J. Am. Chem. Soc. 84, 4090 (1962).

[2] A. Lübcke, F. Buchner, N. Heine, I. V. Hertel and T. Schultz, Phys. Chem. Chem. Phys. 12, 14629 (2010).