Frankfurt 2006 – wissenschaftliches Programm

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MO: Molekülphysik

MO 58: Poster: Spectroscopy in He-Droplets

MO 58.3: Poster

Donnerstag, 16. März 2006, 16:30–18:30, Labsaal

Doping Helium nanodroplets by laser ablation / desorption — •Benjamin Forkl¹, Andreas Branding², Patrick Claas², Frank Stienkemeier¹, and Marcel Mudrich¹ — ¹Physikalisches Institut, Universität Freiburg — ²Fakultät für Physik, Universität Bielefeld

Doping He nanodroplets by means of laser ablation of different metals is investigated. Using a Nd:YAG laser at 10 Hz repetition rate, both refractory metals (Ti, Co) as well as alkaline earth atoms (Mg, Ba) are successfuly ablated and attached to He nanodroplets. Multiple doping has been observed in the case of Mg and Ba. Furthermore, Mg⁺ and Ba⁺ ion-doped He droplets have been observed at quite different droplet source conditions [1].

A new setup based on a Nd:YLF laser at kHz repetion rate operating at 1054, 527, or 263 nm is presented. Both laser ablation as well as matrix-assisted laser desorption/ionization (MALDI) can be implemented. This new source for doping He droplets is a versatile tool for spectroscopy of neutral and charged atoms up to large molecules at mK temperatures.

[1] P. Claas, S.-O. Mende, and F. Stienkemeier, Rev. Sci. Instr. 74 4071 (2003)