Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

A: Fachverband Atomphysik

A 16: Atomic Clusters

A 16.1: Vortrag

Donnerstag, 13. März 2008, 08:30–08:45, 3D

PES study of the photodetachement of water clusters — •Lei Ma, Kiran Majer, Raphael Kuhnen, Fabien Chirot, and Bernd von Issendorff — FMF, Freiburg, Deutschland

The photodetachement of size-selected water cluster anions have been investigated by photoelectron spectroscopy (PES). New features have been observed in the PES spectra for small water clusters ((H₂0_n)⁻, n = 15-25)and heavy-water clusters. In heavy-water clusters, and in some cold (10 K) water clusters, the spectra are consistent with the existence of different isomers. The difference of the electron binding energies in these isomers is in agreement with previous work¹, and could give useful information on the location of the excess electron inside or outside the cluster. This is an important issue for using water clusters as nano-scale analogue of the bulk hydrated electron.

Furthermore, the PES spectra of water clusters show evidence of resonant two-photon photodetachement for cluster as small as (H₂0₂₀)⁻. This two photon process have been studied using femtosecond PES.

¹ Verlet et al., Science 307, 93 (2005)