Soft-landing deposition of radioactive probe atoms on surfaces |
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Authors: | Laurens CR Roşu MF Pleiter F Niesen L |
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Institution: | (1) Nuclear Solid State Physics, Materials Science Center, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands |
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Abstract: | We present a method to deposit a wide range of radioactive probe atoms on surfaces, without introducing lattice damage or
contaminating the surface with other elements or isotopes. In this method, the probe atoms are mass-separated using an isotope
separator, decelerated to 5 eV, and directly deposited on the surface. The method allows for performing hyperfine interactions
experiments using trace amounts of radioactive probes located at surfaces and interfaces. The characteristics of the deposition
method will be described, with particular attention to the deceleration stage of the isotope separator. The method was tested
with perturbed angular correlation (PAC) experiments on the system In on Cu(17,1,1). The results are in agreement with molecular
dynamics simulations of the deposition process. New developments, in particular the study of the self-diffusion of Ag atoms
on Ag(100) by means of PAC with the 111Ag probe, are briefly discussed.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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