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A: Fachverband Atomphysik

A 34: Poster II

A 34.4: Poster

Donnerstag, 5. März 2009, 16:30–19:00, VMP 9 Poster

a closer look to the size dependence of the PES for water clusters:Inernalization of the electron and magic numbers — •Lei Ma^1,2, Fabien Chirot¹, and Bernd von Issendorff¹ — ¹Stefan-Meier-Str.21 79104 Freiburg — ²Nanjing University, Jiangsu Provience, China

ABSTRACT We have recorded photodetachement spectra for cold water cluster anions. By a careful analysis of the spectral shape, we show that the spectral feature assigned to isomer I in previous work [1] has to be seen as the mix of the contributions from two classes of isomers with a slightly different VDE. As size increases, only the high binding energy contribution is left. Together with recent results from Ref[2], this allows to thinking of an alternative scenario for the electron internalization involving clear structural transitions. On the other hand, we note a particularly non monotonic behaviour of the recorded VDE with respect to size in the range n = 50 to 56, which is correlated with a marked structure in the measured mass spectrum.

[1]Aster Kammrath, Jan R. R. Verlet, Graham B. Griffin, and Daniel M. Neumarka THE JOURNAL OF CHEMICAL PHYSICS 125, 076101 (2006) [2]Characterization of Excess Electrons in Water-Cluster Anions by Quantum Simulations Science 309, 914 (2005)