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Zeitschrift für Physik D Atoms, Molecules and Clusters
ISSN: 0178-7683 (printed version)
ISSN: 1431-5866 (electronic version)
Abstract Volume 39 Issue 1 (1997) pp 1-2
The UV-absorption of europium atoms embedded in helium nanodroplets
A. Bartelt, J.D. Close, F. Federmann, K. Hoffmann, N. Quaas, J.P. Toennies
Max-Planck-Institut für Strömungsforschung, Bunsenstrasse 10, D-37073 Göttingen, Germany (e-mail: ffederm@gwdg.de)
Received: 1 October 1996
Abstract. We have measured the UV-absorption spectrum (4f$\rightarrow$5d transitions) of single europium atoms embedded in helium droplets using a beam depletion technique. The electronic levels involved in the transition lie spatially within the closed 6s$^2$ shell leading to significant shielding from the surrounding helium environment. We observe the narrowest absorption lines ever reported in liquid helium and compare our data and experimental method, with experiments carried out in bulk liquid helium.
PACS: 67.80. Mg; 36.40. Vz
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