Dresden 2011 – scientific programme

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A: Fachverband Atomphysik

A 19: Atomic clusters I

A 19.4: Talk

Thursday, March 17, 2011, 11:30–11:45, BAR 205

Velocity-Map-Imaging Spectroscopy of Alkali Metals Embedded Inside Helium Nanodroplets — •Lutz Fechner, Marcel Mudrich, and Frank Stienkemeier — Physikalisches Institut, Universität Freiburg, 79104 Freiburg, Germany

Helium nanodroplets provide an ‘ideal’ matrix for spectroscopy of embedded molecules due to the low temperature conditions (400 mK) and extremely weak guest-host interactions. However, photoionization spectroscopy has mostly been hampered by the trapping of photoions in ‘snowballs’ that remain bound to the droplets which prevents efficient ion detection. Therefore, a new velocity-map-imaging spectrometer for photo-electrons has been built and characterized. In first experiments rubidium atoms are studied in a resonance-enhanced-multiphoton-ionization (REMPI) scheme by means of electron as well as ion imaging-spectroscopy. Gas-phase measurements are compared to spectra obtained with atoms attached to the surface of helium nanodroplets. These measurements pave the ground for future femtosecond photoionization studies of molecules embedded inside helium nanodroplets.