ALKALI-METAL ATOMS AS SPIN LABELS ON HELIUM NANODROPLETS

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 dc.creator Koch, Markus en_US dc.creator Ratschek, Martin en_US dc.creator Callegari, Carlo en_US dc.creator Ernst, Wolfgang E. en_US dc.date.accessioned 2010-07-12T13:45:09Z dc.date.available 2010-07-12T13:45:09Z dc.date.issued 2010 en_US dc.identifier 2010-FB-06 en_US dc.identifier.uri http://hdl.handle.net/1811/46018 dc.description Author Institution: Institute of Experimental Physics, TU Graz, Petersgasse 16, 8010 Graz, Austria en_US dc.description.abstract We have recently achieved electron spin resonance (ESR) of single alkali-metal atoms isolated on helium (He) nanodroplets. A two-laser pump/probe setup for optically detected magnetic resonance is applied, which is based on magnetic circular dichroism to selectively address spin states. The influence of the helium droplet on the alkali-metal valence-electron wave function is directly noticeable as a shift of the ESR transitions with respect to that of free atoms. This perturbation depends on the size of the droplets and can be modeled with an increase of the hyperfine constant, that is an increase of the Fermi contact interaction. After careful characterization of the Rb--He-droplet system the method is being developed into a more universal diagnostic tool to study spin dynamics. ESR silent species located inside the droplet can be investigated by utilizing the surface Rb atom as spin label, and the droplet size is a convenient handle to control the distance between the two. In case of species with a nuclear spin (e.g., $^{129}$Xe) spin exchange between the optically pumped Rb atom and the nuclear spin can be studied. We are also extending our method to study magnetically active materials of technological importance, such as Cr, Cu, and small clusters thereof, and we strive to present the first results at the meeting. en_US dc.language.iso en en_US dc.publisher Ohio State University en_US dc.title ALKALI-METAL ATOMS AS SPIN LABELS ON HELIUM NANODROPLETS en_US dc.type Article en_US