Hannover 2016 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 39: Interaction with VUV and X-ray light
A 39.1: Hauptvortrag
Freitag, 4. März 2016, 11:00–11:30, f303
Enhanced ionization of embedded clusters by electron transfer mediated decay in helium nanodroplets — •A. C. LaForge1, V. Stumpf2, K. Gokhberg2, J. von Vangerow1, N. V. Kryzhevoi2, P. O'Keeffe3, A. Ciavardini3, S. Krishnan4, K. C. Prince5, R. Richter5, R. Moshammer6, T. Pfeifer6, L. S. Cederbaum2, F. Stienkemeier1, and M. Mudrich1 — 1Physikalisches Institut, Universität Freiburg, 79104 Freiburg, Germany — 2Physikalisch-Chemisches Institut, Universität Heidelberg, 69120 Heidelberg, Germany — 3CNR - Istituto di Struttura della Materia, CP10, 00016 Monterotondo Scalo, Italy — 4Department of Physics, Indian Institute of Technology - Madras, Chennai 600 036, India — 5Elettra-Sincrotrone Trieste, 34149 Basovizza, Trieste, Italy — 6Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
Here, we report the observation of electron transfer mediated decay involving Mg clusters embedded in helium nanodroplets which is initiated by the ionization of helium followed by removal of two electrons from the Mg clusters of which one is transferred to the He environment neutralizing it while the other electron is emitted into the continuum. The process is shown to be the dominant ionization mechanism for embedded clusters for photon energies above the ionization potential of He. The photoelectron spectrum reveals a low energy ETMD peak. For Mg clusters larger than 5 atoms we observe stable doubly-ionized clusters. We argue that ETMD provides a new pathway to the formation of doubly-ionized cold species.