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MO: Fachverband Molekülphysik

MO 12: Femtosecond Spectroscopy III

MO 12.7: Talk

Tuesday, March 13, 2012, 15:45–16:00, V38.03

Time Resolved Photoelectron Photoion Coincidence Spectra of Sodium Doped Water Clusters — Jan P. Müller^1,2, Ingolf V. Hertel¹, and •C.P. Schulz¹ — ¹Max Born Institute, Max-Born-Str. 2a, 12489 Berlin — ²Now at: TU Berlin, Institut für Optik und Atomare Physik, Hardenbergstrasse 36, 10623 Berlin

Gas phase clusters of polar solvent molecules doped with an alkali metal atom are model systems for studying the behaviour of loosely bound metal valence electrons in a polar environment. In recent years, we have studied the lifetime of the first electronically excited state of sodium doped water clusters (Na(H₂O)_n). It was found that the lifetime decreases rapidly with increasing cluster size down to about 100 fs for n≥20 [1]. These short lifetimes are presumably provoked by fast internal conversion, which is strongly correlated to the DOS of the intra molecular vibrations. Recently, we have performed time-resolved photoelectron photoion coincidence experiments. From the measured kinetic energy distributions of the electrons we gain more insight into the relaxation process. The results will be compared to similar measurements on negatively charged water clusters [2].

[1] H.T. Liu, J.P. Müller, N. Zhavoronkov, C.P. Schulz, I.V. Hertel, J. Phys. Chem. A, 114, 1508 (2010).

[2] G.B. Griffin, R.M. Young, O.T. Ehrler, D.M. Neumark, J. Chem. Phys., 131, 194302 (2009).