Concept

Unité de masse atomique unifiée

Publications associées (50)

Design of the new METAS watt balance experiment Mark II

The kilogram is the last unit of the international system of units (SI) still based on a material artefact, the international prototype of the kilogram (IPK). The comparisons made in the last hundred years have clearly revealed a long-term relative drift b ...

Iop Publishing Ltd2013

Simultaneous measurement of lithium and fluorine momentum in

Michele Ceriotti

We present momentum widths and mean kinetic energies of lithium and fluorine in 7LiF, as determined simultaneously from deep inelastic neutron scattering (DINS) measurements. Experimental data across a temperature range from 4 to 300K are presented, and th ...

2012

Nature of Weak Magnetism in SrTiO3/LaAlO3 Multilayers

Thorsten Schmitt

We report the observation of weak magnetism in superlattices of LaAlO3/SrTiO3 using beta-detected nuclear magnetic resonance. The spin lattice relaxation rate of Li-8 in superlattices with a spacer layers of 8 and 6 unit cells of LaAlO3 exhibits a strong p ...

Amer Physical Soc2012

Scanning tunneling microscopy at multiple voltage biases of stable “ring-like” Ag clusters on Si(111)–(7×7)

Corsin Battaglia, Laure-Emmanuelle Perret Aebi, Philipp Aebi

Since more than twenty years it is known that deposition of Ag onto Si(111)–(7×7) leads under certain conditions to the formation of so-called “ring-like” clusters, that are particularly stable among small clusters. In order to resolve their still unknown ...

Elsevier2012

Kinetics of a-Si:H bulk defect and a-Si:H/c-Si interface-state reduction

Christophe Ballif, Stefaan De Wolf

Low-temperature annealing of hydrogenated amorphous silicon (a-Si:H) is investigated. An identical energy barrier is found for the reduction of deep defects in the bulk of a-Si:H films and at the interface such layers form with crystalline Si (c-Si) surfac ...

2012

On uncertainty estimates of crystallographic quantities including cell-parameter uncertainties

Dieter Schwarzenbach

In a recent publication, Haestier [J. Appl. Cryst. (2009), 42, 798-809] has proposed a method to take care of the unit-cell-parameter uncertainties in the calculation of geometric quantities such as interatomic distances and bond angles by modifying the un ...

2010

Assessment of metal-extracellular polymeric substances interactions by asymmetrical flow field-flow fractionation coupled to inductively coupled plasma mass spectrometry

Enrica Alasonati

Extracellular polymeric substances (EPSs) excreted by the bacterium Sinorhizobium meliloti and associated Ca, Cd and Pb were characterised by asymmetrical flow field-flow fractionation coupled with UV spectrophotometry and inductively coupled plasma mass s ...

2010

Metal-Based Chemosensors for Important Bioanalytes

Sébastien Rochat

This work describes different strategies for the detection of biologically relevant analytes. The main goal was to achieve sensing in water, which is a prerequisite for application to real biological samples. In several cases, we could demonstrate that our ...

EPFL2010

Input silane concentration effect on the a-Si:H to uc-Si:H transition width

Christophe Ballif, Christoph Hollenstein, Grégory Bugnon, Andrea Feltrin, Benjamin Strahm, Fanny Sculati-Meillaud

In this work the microstructure transition width from amorphous to microcrystalline silicon is discussed. It is shown that the width of the transition depends on the input silane concentration level and indirectly on the silane depletion level. The higher ...

2010

NMR Crystallography of Campho[2,3-c]pyrazole (Z `=6): Combining High-Resolution H-1-C-13 Solid-State MAS NMR Spectroscopy and GIPAW Chemical-Shift Calculations

David Lyndon Emsley

H-1-C-13 two-dimensional magic-angle spinning (MAS) solid-state NMR correlation spectra, recorded with the MAS-J-HMQC experiment, are presented for campho[2,3-c]pyrazole. For each C-13 moiety, there are six resonances associated with the six distinct molec ...

AMER CHEMICAL SOC2010

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