25 research outputs found
Diffusion study of 15N implanted into α-Ti using the nuclear resonance technique
No full textThe diffusion of 15 N in a-Ti was studied in the 673-1023 K temperature range by using ion implantation and nuclear resonance techniques. The measurements show that the diffusion coefficients follow an Arrhenius behaviour D(T) = D0 exp (-Q/RT) where D0 = (1.1 ± 0.8) x 10-7 m2 s-1 and Q = (183 ± 2) kJ/mol. A comparison with previous results is also given.Fil: Bregolin, F. L.. Universidade Federal do Rio Grande do Sul; BrasilFil: Behar, M.. Universidade Federal do Rio Grande do Sul; BrasilFil: Dyment, Fanny. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin
External RBS analysis setup at University of Göttingen: RBS analysis for liquid samples
No full textIn this work, we describe new developments in the external analysis setup at University of Göttingen. The aim of this work is to expand the ability of the setup for performing Rutherford backscattering spectrometry (RBS) in atmospheric condition. This work presents the detail of the developed device for external RBS, as well as the initial result of RBS analysis for a volatile liquid sample. We also made an electrochemical cell with a Si 3 N 4 window designed for external RBS analysis. By using this setup, we have successfully acquired the change of composition around an electrode/liquid electrolyte interface. Since RBS can give us quantitative depth information, the external RBS developed here will open a way to characterize a solid‐liquid interface quantitatively and understand the chemical reaction of the interface
Improved set-up for the ytterbium optical clock at INRIM
No full textWe present an upgraded setup for cooling and trapping of ytterbium atoms in a optical clock experiment. The experiment aims to cool and trap ytterbium atoms in a two stage magneto-optical trap (MOT) (at 399nm and 556nm for the first and second stage, respectively) and to probe the narrow-line clock transition at 578 nm in an optical lattice at the magic wavelength (759 nm). We describe here the generation of all the laser sources and the design of a new physic package, including the vacuum chamber and the atomic source
Diffusion study of nitrogen implanted into α-Hf using the nuclear resonance technique
No full textThe diffusion of nitrogen in a-Hf was studied in the temperature range of (823-1123)K using the ion implantation and nuclear resonance techniques. The measurements show that the diffusion coefficients follow an Arrhenius behaviour D (T) = D0 exp (-Q / RT) with D0 = (5.5 ± 2.0) ×10-7 m2s-1 and Q = (228 ±1) kJ/mol. A comparison of the present results with the previous one is made. The difference between them can be attributed to the different purity of the samples used in each experiment.Fil: Bregolin, F. L.. Universidade Federal do Rio Grande do Sul; BrasilFil: Behar, Andrea Marcela. Universidade Federal do Rio Grande do Sul; BrasilFil: Dyment, Fanny. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin
External RBS/PIXE analysis for evaluating quantum dots internalization into HeLa cells.
No full textWe have developed an external RBS/PIXE setup at University of Gottingen. By using this setup, the analysis can be performed in atmospheric condition, which leads to realizing a quantitative analysis for volatile samples with depth information. We applied this technique for HeLa cells, internalized CdSe quantum dots (Q-dot). External RBS shows the depth difference of Q-dot depth distribution in cells, w or w/o the treatment with an endocytosis inhibitor, which agrees well with the result of confocal microscopy. The quantity of Q-dot is also evaluated by external PIXE, which coincides with the result of RBS and fluorescence measurement. In addition, the application of Si3N4 film as a medium for HeLa cells is presented
Improved Set-Up for the Ytterbium Optical Clock at INRIM
No full textWe present an upgraded setup for cooling and
trapping of ytterbium atoms in a optical clock experiment. The
experiment aims to cool and trap ytterbium atoms in a two stage
magneto-optical trap (MOT) (at 399 nm and 556 nm for the first
and second stage, respectively) and to probe the narrow-line clock
transition at 578 nm in an optical lattice at the magic wavelength
(759 nm). We describe here the generation of all the laser sources
and the design of a new physic package, including the vacuum
chamber and the atomic sourc
Optical Atomic Clocks: From International Timekeeping to Gravity Potential Measurement
No full textPaper SM1F.3 - From the session Optical Clocks (SM1F).We discuss the relation between atomic clocks and gravity from two perspectives: gravity potential measurements for optical clock comparisons and contributions to international timescales and, conversely, the measurement of gravity potential differences using optical clocks.Helen S. Margolis, Heiner Denker, Christian Voigt, Ludger Timmen, Jacopo Grotti, Silvio Koller, Stefan Vogt, Sebastian Häfner, Uwe Sterr, Christian Lisdat, Antoine Rolland, Fred N. Baynes, Michel Zampaolo, Pierre Thoumany, Marco Pizzocaro, Benjamin Rauf, Filippo Bregolin, Anna Tampellini, Piero Barbieri, Massimo Zucco, Giovanni A. Costanzo, Cecilia Clivati, Filippo Levi, and Davide Calonic
