Résonance paramagnétique électronique

Science de la nature
Chimie
Chimie physique
Spectroscopie

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Extending the lifetime of hyperpolarisation

Xiao Ji

In nuclear magnetic resonance (NMR), one of the most serious inherent challenges is the low sensibility of nuclei. In order to enhance the signal of NMR experiments, the technique of dynamic nuclear hyperpolarisation (DNP) was introduced in the 1950s, lead ...

EPFL2017

Nanoscale structural oscillations in perovskite oxides induced by oxygen evolution

Vasiliki Tileli

Understanding the interaction between water and oxides is critical for many technological applications, including energy storage, surface wetting/self-cleaning, photocatalysis and sensors. Here, we report observations of strong structural oscillations of B ...

Nature Publishing Group2017

Potential energy-driven spin manipulation via a controllable hydrogen ligand

Klaus Kern, Markus Ternes

Spin-bearing molecules can be stabilized on surfaces and in junctions with desirable properties, such as a net spin that can be adjusted by external stimuli. Using scanning probes, initial and final spin states can be deduced from topographic or spectrosco ...

Amer Assoc Advancement Science2017

Nanoscale topographical control of capillary assembly of nanoparticles

Jürgen Brugger, Olivier Martin, Duncan Alexander, Massimo Mastrangeli, Elmira Shahrabi, Jérémy Butet, Valentin Flauraud, Gabriel David Bernasconi

Predetermined and selective placement of nanoparticles onto large-area substrates with nanometre-scale precision is essential to harness the unique properties of nanoparticle assemblies, in particular for functional optical and electro-optical nanodevices. ...

2017

Fermi resonance in CO2: Mode assignment and quantum nuclear effects from first principles molecular dynamics

Sara Bonella, Guillaume André Jean Fraux

Vibrational spectroscopy is a fundamental tool to investigate local atomic arrangements and the effect of the environment, provided that the spectral features can be correctly assigned. This can be challenging in experiments and simulations when double pea ...

Amer Inst Physics2017

Gate-tunable black phosphorus spin valve with nanosecond spin lifetimes

Ahmet Avsar

Two-dimensional materials offer new opportunities for both fundamental science and technological applications, by exploiting the electron's spin. Although graphene is very promising for spin communication due to its extraordinary electron mobility, the lac ...

Nature Publishing Group2017

Dynamic Nuclear Polarization of Long-Lived Nuclear Spin States in Methyl Groups

Geoffrey Bodenhausen, Aurélien Bornet, Sami Jannin, Basile Vuichoud, Arthur César Pinon, Gabriele Stevanato, Daniele Mammoli

We have induced hyperpolarized long-lived states in compounds containing C-13-bearing methyl groups by dynamic nuclear polarization (DNP) at cryogenic temperatures, followed by dissolution with a warm solvent. The hyper polarized methyl long-lived states g ...

Amer Chemical Soc2017

Ab initio study of electron energy loss spectra of bulk bismuth up to 100 eV

Iurii Timrov

The dynamical charge-density response of bulk bismuth has been studied within time-dependent density functional perturbation theory, explicitly accounting for spin-orbit coupling. The use of the Liouville-Lanczos approach allows us to calculate electron en ...

Amer Physical Soc2017

A novel synthetic approach of cerium oxide nanoparticles with improved biomedical activity

Francesco Stellacci, Andrzej Sienkiewicz, Marta Mameli, Fanny Caputo

Cerium oxide nanoparticles (CNPs) are novel synthetic antioxidant agents proposed for treating oxidative stress-related diseases. The synthesis of high-quality CNPs for biomedical applications remains a challenging task. A major concern for a safe use of C ...

Nature Publishing Group2017

Broadband single-chip transceivers for compact NMR probes

Marco Grisi

Nuclear magnetic resonance (NMR) is one of the most relevant spectroscopic tools in use today. However, NMR requires relatively expensive and complicated experimental settings given by the combination of high homogeneous magnetic fields and a relatively co ...

EPFL2017

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