Hannover 2013 – scientific programme
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A: Fachverband Atomphysik
A 9: Interaction with strong or short laser pulses I
A 9.7: Talk
Monday, March 18, 2013, 18:15–18:30, B 305
Autoionization of Helium Nanodroplets Induced by Intense VUV Light Pulses — •Aaron LaForge1, Michele Alagia6, Lorenzo Avaldi2, Carlo Callegari3, Marcello Coreno2, Michele Devetta4, Marcel Drabbels5, Raphael Katzy1, Antti Kivimaki6, Viktor Lyamayev1, Tommaso Mazza7, Thomas Möller8, Marcel Mudrich1, Yevheniy Ovcharenko8, Paolo Piseri4, Kevin Prince3, Robert Richter3, Michele Di Fraia10, Stefano Stranges9, and Frank Stienkemeier1 — 1Universität Freiburg, Germany — 2CNR-IMIP Rome, Italy — 3Sincrotrone Trieste, Italy — 4University of Milan, Italy — 5EPFL Lausanne, Switzerland — 6CNR-IOM Trieste, Italy — 7European XFEL GmbH, Germany — 8Technische Universität Berlin, Germany — 9University of Rome "Sapienza", Italy — 10University of Trieste
Ionization of helium nanodroplets was performed by the VUV-seeded FEL FERMI@Elettra. Using the unique tunability of the seed laser along with the high intensity of the FEL, it is possible to resonantly excite the nanodroplets such that almost the entire cluster is excited. In this state, neighboring excited atoms can decay via energy transfer similar to a doubly excited state decaying by autoionization. This effect leads to an enhancement in the abundance of ions. To observe the effects, one compares the power dependencies on the ion yield for various excited states to those of non-resonant ionization and direct ionization.