Hannover 2016 – scientific programme

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MO: Fachverband Molekülphysik

MO 21: Cold Molecules & Helium Droplets 2

MO 21.4: Talk

Friday, March 4, 2016, 12:00–12:15, f142

Light induced collapse of magnesium foam in helium droplets investigated by photoelectron spectroscopy — •Lev Kazak, Josef Tiggesbäumker, and Karl-Heinz Meiwes-Broer — Institute of Physics, University of Rostock, Albert-Einstein-Str. 24,18059 Rostock, Germany

Recent investigation shows, that magnesium atoms embedded in helium droplets are exist in metastable network of single atoms surrounded by the layer of helium atoms, called foam. The resonant two-photon ionization (R2PI) of Mg atom doped helium droplet reveals a narrow peak blue-shifted relative to atomic transition at λ=279 nm. For droplet containing more than one Mg atom, additional peak at λ= 282 nm appears. This feature is presented irrespective to the cluster size (up to Mg20). It suggests that before the absorption of the photon, single magnesium atoms are dissolved within the droplets, with interatomic Mg-Mg distance about 10 Å. Here we are using photoelectron spectroscopy to reveal the electronic structure of Mg complexes. The magnesium aggregate are probed by R2PI in vicinity of 31P10-31So transition in the wavelength region 276-284 nm. Complex photoelectron spectra arise when more than one magnesium atom is present in the dropletd. Additionally, peaks, which corresponds to highly exited atoms appears, indicating a possible relaxation of the metastable structure. The photoelectron spectra at different doping conditions will be disscused.