Freiburg 2024 – scientific programme
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A: Fachverband Atomphysik
A 34: Poster VII
A 34.4: Poster
Thursday, March 14, 2024, 17:00–19:00, Tent B
multiply charged ions from highly-charged helium droplets — •shaimaa Habib1,2, S Bergmeister1, L Ganner1, F Foitzik1, I Stromberg1, F Zappa1, O Echt1, P Scheier1, and E Gruber1 — 11Universität Innsbruck, Institut für Ionenphysik und Angewandte Physik, Technikerstr. 25, A-6020 Innsbruck, Austria — 2Faculty of Science, Damnhour University, Egypt
Helium droplets have been demonstrated to pick up dopants from the gas phase, and evaporative cooling enables experiments at temperatures below 1 K [1]. Massive doping of neutral droplets leads to the formation of nanoparticles and quantum wires which were studied after deposition with high resolution microscopy [2] and in situ via coherent X-ray diffraction [3]. Recently, we discovered that large helium droplets can become highly-charged [4]. The charge centers self-organize as two-dimensional Wigner crystals at the surface of the droplets and act as seeds for the growth of dopant clusters [5]. Cluster ions and charged nanoparticles of a specific size and composition can be formed by this technique with unprecedented efficiency. Dopant cluster ions can be extracted by collision induced evaporation of the host droplet [6,7] or by splashing of the droplet upon surface impact [8]. Both methods are suitable to form high yields of He tagged ions of both polarities which enables messenger type spectroscopy of all kinds of cold ions.
Keywords: gas phase; quantum wires; two-dimensional Wigner crystals; cluster ions