Concept

Liquid helium

Related publications (104)

Single molecule fluorescence resonance energy transfer scanning near-field optical microscopy: potentials and challenges

Giovanni Dietler, Mounir Driss Mensi, Anton Smirnov, Kanat Dukenbayev, Ekaterina Rostova, Andrey Mikhaylov

A few years ago, single molecule Fluorescence Resonance Energy Transfer Scanning Near-Field Optical Microscope (FRET SNOM) images were demonstrated using CdSe semiconductor nanocrystal-dye molecules as donor-acceptor pairs. Corresponding experiments reveal ...

Royal Soc Chemistry2015

Spontaneously broken mass

Solomon G Shamsuddin Osman Endlich

The Galilei group involves mass as a central charge. We show that the associated superselection rule is incompatible with the observed phenomenology of superfluid helium 4: this is recovered only under the assumption that mass is spontaneou.519 broken. Thi ...

Springer2015

Accurate and Inexpensive Prediction of the Color Optical Properties of Anthocyanins in Solution

Iurii Timrov

The simulation of the color optical properties of molecular dyes in liquid solution requires the calculation of time evolution of the solute absorption spectra fluctuating in the solvent at finite temperature. Time-averaged spectra can be directly evaluate ...

Amer Chemical Soc2015

Gentle quantitative measurement of helium density in nanobubbles in silicon by spectrum imaging

Cécile Hébert, Duncan Thomas Lindsay Alexander, Guillaume Lucas

We propose an original method for the determination of the physical properties of nanometer sized helium bubbles using spectrum imaging in an energy-filtered transmission electron microscope. Helium bubbles synthesized by high fluence implantation and ther ...

Pergamon-Elsevier Science Ltd2015

Nanoporous Materials Can Tune the Critical Point of a Pure Substance

Berend Smit, Efrem Daniel Braun, Sondre Kvalvag Schnell

Molecular simulations and NMR relaxometry experiments demonstrate that pure benzene or xylene confined in isoreticular metal-organic frameworks (IRMOFs) exhibit true vapor-liquid phase equilibria where the effective critical point may be reduced by tuning ...

Wiley-Blackwell2015

Elementary Excitations of Superfluid Helium Droplets Probed by Ion Spectroscopy

Marcel Drabbels, Xiaohang Zhang

Electronic spectra of molecules in helium droplets reveal spectral features that are related to the elementary excitations of the superfluid helium environment. In order to determine to what extend the interaction strength of the molecule with the helium a ...

Amer Chemical Soc2014

Coherent cooperative fluorescence resonance energy transfer

Cooperative fluorescence resonance energy transfer effect is experimentally demonstrated for a few crystals doped with rare-earth ions. We show that, at the liquid helium temperatures in similar crystals, coherent cooperative fluorescence resonance energy ...

Maik Nauka/Interperiodica/Springer2014

Helium ion irradiation induced swelling and hardening in commercial and experimental ODS steels

Manuel Alexandre Pouchon, Loïc Guillaume Fave

The radiation resistance of two promising ferritic ODS steels, PM2000 and 15CRA-3, is studied. More specifically, the effect of helium on these materials is studied by examining the swelling and hardening after He+ implantation to ∼1 dpa at 4000 appm/dpa. ...

Elsevier2014

Adiabatic Demagnetisation Refrigeration Extension for SQUID Magnetometer

Kjersti Skaaraaen Herberg

A method for decreasing the minimum temperature achievable by a SQUID magnetometer is presented, based on adiabatic demagnetisation refrigeration. The method is found to successfully provide cooling to below 0.26 K for more than an hour. However, performin ...

2014

Dynamics of Excited Sodium Atoms Attached to Helium Nanodroplets

Marcel Drabbels, Evgeniy Loginov

The dynamics of laser-excited sodium atoms at the surface of helium nanodroplets has been investigated as a function of quantum state. For all cases excitation of the system leads to desorption of the sodium atom from the droplet surface. The mean kinetic ...

American Chemical Society2014

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