Surface location of alkaline-earth atom impurities on helium nanodroplets

Details Surface location of alkaline-earth atom impurities on helium nanodroplets Surface location of alkaline-earth atom impurities on helium nanodroplets

2007-09-04

arxiv.org/abs/0709.0491v1

Physical Review A 76, 043204 (2007)

Physics

Condensed Matter

Other Condensed Matter

11 pages, 3 figures

Scientific paper

10.1103/PhysRevA.76.043204

There has been notable uncertainty regarding the degree of solvation of alkaline-earth atoms, especially Mg, in free He-4 nanodroplets. We have measured the electron energy dependence of the ionization yield of picked-up atoms. There is a qualitative shape difference between the yield curves of species solvated in the middle of the droplet and species located in the surface region; this difference arises from the enhanced role played by the Penning ionization process in the latter case. The measurements demonstrate that Mg, Ca, Sr and Ba all reside at or near the droplet surface.

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