Xe AND Rb ATOMS ON HELIUM NANODROPLETS: IS THE VAN DER WAALS ATTRACTION STRONG ENOUGH TO FORM A MOLECULE?

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Title: Xe AND Rb ATOMS ON HELIUM NANODROPLETS: IS THE VAN DER WAALS ATTRACTION STRONG ENOUGH TO FORM A MOLECULE?
Creators: Poms, Johannes; Hauser, Andreas W.; Ernst, Wolfgang E.
Issue Date: 2013
Publisher: Ohio State University
Abstract: Chemical reactions in the cold environment of a helium nanodroplet currently attract high interest and can be spectroscopically observed with typical molecular beam techniques. In order to estimate the influence of surrounding helium on the van der Waals interaction between heliophilic and heliophobic dopants that could be investigated in our lab with ESR spectroscopy, we apply density-functional theory to simulate a double-dotation of He-clusters with Rb and Xe atoms. Simulations of a double-doped He$_{N}$ droplet with N\,=\,500 show that the alkali metal atom stays on the surface, whereas the Xe atom sits in the middle of the droplet. The van der Waals attraction between Rb and Xe is not strong enough to compensate the separation of the heliophilic Xe and the heliophobic Rb caused by the helium droplet: a potential barrier of 23.4\,K has to be overcome, which is to be compared with the 0.4 K internal temperature of the droplet.
Description: Author Institution: Institute of Experimental Physics, Graz University of Technology, Petersgasse 16, A-8010 Graz, Austria
URI: http://hdl.handle.net/1811/55488
Other Identifiers: 2013-WG-06
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