A UHV compatible source for a highly polarized thermal atomic beam of radioactive 8Li

Jänsch, H.J.; Kirchner, Georg; Kühlert, O.; Lisowski, M.; Paggel, J. J.; Platzer, R.; Schillinger, R.; Tilsner, H.; Weindel, C.; Winnefeld, H.; Fick, D.

doi:10.1016/s0168-583x(00)00302-5

Cited by 10 publications

(2 citation statements)

References 17 publications

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“…Conventional analytical techniques were used along with the ␤-NMR. 44 The latter utilizes ␤-decaying nuclear spin polarized radioactive 8 Li atoms as a probe. A homemade fast load lock is connected to the UHV-chamber.…”

Section: Experimental Technique and Setupmentioning

confidence: 99%

“…44 At the site of the sample it provides a thermal atomic beam of about 10 8 atoms/ s, mainly the primary 7 Li used for the production of the 8 Li in the 2 H͑ 7 Li, 8 Li͒ 1 H nuclear reaction. The beam contains a small amount of about 10 4 atoms/ s of the nuclear spin polarized radioactive isotope 8 Li ͑polarization 0.8-0.9͒.…”

Section: Experimental Technique and Setupmentioning

confidence: 99%

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MetallicSi(111)−(7×7)-reconstruction: A surface close to a Mott-Hubbard metal-insulator transition

et al. 2005

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Li adsorption at extremely low coverages ͑10 −3 ML and below͒ on the metallic Si͑111͒-͑7 ϫ 7͒ surface has been studied by ␤-NMR experiments ͑measurement of T 1 -times͒. Instead of increasing linearly with the sample temperature, as expected for a metallic system, the relaxation rate ␣ =1/T 1 is almost constant in between 50 K and 300 K sample temperature and rises considerably above. Comparison with T 1 -times around 900 K ͑ob-served with 6 Li-NMR͒ excludes adsorbate diffusion as the cause of the relaxation rate. Thus the almost temperature independent relaxation rate below 300 K points to an extremely localized and thus narrow band ͑width about 10 meV͒ which pins the Fermi energy. It is responsible for the metallicity of the ͑7 ϫ 7͒-reconstruction. Because of the steeply rising relaxation rate beyond 300 K this narrow band is located energetically within a gap ͑approximately 100-500 meV wide͒ in between a lower filled and an upper empty ͑Hubbard͒ band. Due to its extremely narrow width it can hardly be detected in photo electron experiments. In dynamical mean field theories based on Hubbard Hamiltonians this kind of density of states is typical for correlated electron systems close to a Mott-Hubbard metal-insulator transition.

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Section: Experimental Technique and Setupmentioning

confidence: 99%