Darmstadt 2008 – scientific programme
Parts | Days | Selection | Search | Downloads | Help
A: Fachverband Atomphysik
A 10: Posters: Atomic clusters
A 10.11: Poster
Tuesday, March 11, 2008, 16:30–18:30, Poster C3
Ultrafast Dynamics of Neutral Sodium-Doped Water Clusters — •HongTao Liu, Jan Philippe Müller, Claus Peter Schulz, Christian Schröter, Nickolai Zhavoronkov, and Ingolf-Volker Hertel — Max-Born-Institute, Berlin, Germany
By doping pure water clusters with sodium atoms, the valence electron of sodium interacts with the dipole field of the water clusters. For Na(H2O)n clusters with increasing size n≥4 the atomic 3s electron gets more and more detatched from the core atom, it becomes the well-known solvated electron in the bulk water [1].
One topic of our research is the lifetime of the lowest electronically excited state. Previous works in our group have shown, that the lifetimes strongly decreases for larger n [2]. For n ≥ 4 they are on the order of 100 fs and lower. Similar results have been obtained for negatively charged pure water clusters [3, 4]. This short lifetimes are presumably provoked by fast internal conversion, which is strongly correlated to the DOS of the vibrons [2]. To resolve the lifetime for larger clusters n ≤ 20 two colour pump-probe spectroscopy (800/ 400 nm) with 30 fs pulses has been used and will be discussed in this contribution.
[1] C.P. Schulz, C. Bobbert, T. Shimosato, K. Daigoku, N. Miura, K. Hashimoto, J. Chem. Phys. 119 (2003) 11620
[2] C.P. Schulz, A. Scholz, I.V. Hertel, Isr. J. Chem 44 (2004) 19
[3] J.R.R. Verlet, A.E. Bragg, A. Kammrath, O. Cheshnovski, D.M. Neumark, Science 307 (2005) 93
[4] A.E. Bragg, J.R.R. Verlet, A. Kammrath, O. Cheshnovski, D.M. Neumark, J. Am. Chem. Soc.127 (2005) 15283