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A: Fachverband Atomphysik
A 9: Interaction with strong or short laser pulses I
A 9.5: Talk
Monday, March 18, 2013, 17:45–18:00, B 305
Geometric effects in dopant-induced helium nanoplasmas — Barbara Grüner, Manuel Rometsch, Frank Stienkemeier, and •Marcel Mudrich — Physikalisches Institut, Universität Freiburg
He nanodroplets are widely used as a cold and weakly perturbing matrix for studying embedded molecules and clusters by laser spectroscopy. However, when the impurity atoms are ionized using strong NIR laser pulses the He droplets can turn into highly absorbing nanoplasmas. As a result, we measure high yields of He+ and He2+ ions as well as increased charge states of the impurities compared to the neat impurity clusters. Surprisingly, we find the efficiency of igniting the He nanoplasma to strongly depend on the location of the impurities with respect to the droplet surface, as demonstrated using alkali and earth-alkali metals instead of rare gases as dopants.