Hannover 2010 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 10: Poster: Spectroscopy in He Droplets
MO 10.2: Poster
Dienstag, 9. März 2010, 16:00–18:30, Lichthof
Time-of-flight and velocity-map-imaging detectors for femtosecond pump-probe experiments in helium nanodroplets — •Lutz Fechner, Marcel Mudrich, and Frank Stienkemeier — Physikalisches Institut, Universität Freiburg, 79104 Freiburg, Germany
A time-of-flight as well as a velocity-map-imaging detector are developed for photoionization spectroscopy of molecules attached to helium nanodroplets. Upon ionization the formed molecular ions either leave the helium droplet or remain inside. The latter results in an object of very small charge-to-mass ratio. We present a new time-of-flight detector design that covers the mass range from 1 up to 105 amu even with ion extraction perpendicular to the molecular beam axis.
The new velocity-map-imaging detector is optimized for achieving high photoelectron energy resolution using a simple design. Photoelectron spectroscopy as well as ion-imaging in combination with femtosecond pump-probe photoionization will open a variety of new experiments including wave-packet dynamics of molecules embedded inside helium nanodroplets.