Science with Second Target Station instruments
17 Dec 2010




Advances in science using instruments from the Second Target Station

‘Head space’ apparatus for measurement of the evaporation of volatile molecules incorporated into surfactant layers on Inter.


Over the past year, Inter has hosted a range of experiments from electrochemistry to biocompatible surfactants and ‘designer’ DNA adsorption. A new stream of research enabled by the reflectometer has been the study of kinetics and complexity. As an example, the figure shows a recent experiment to measure the evaporation of volatile molecules incorporated into surfactant layers. Inter’s high flux allows the kinetics of such transport mechanisms to be investigated with a time resolution better than 30s, with further improvement planned.

Inter ‘Head space’ apparatus

‘Head space’ apparatus for measurement of the evaporation of volatile molecules incorporated into surfactant layers on Inter.
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Offspec has started its user programme with successful experiments in both Spin Echo Small Angle Neutron Scattering (SESANS) and Spin-Echo Resolved Grazing Incidence Scattering modes (SERGIS), the only regularly operating user instrument in the World with these techniques. Grating samples have shown that it is possible to access length scales of order 100 nm for some samples. In standard reflectivity mode, using two incident angles and a resolution of ~3%, measurement times of around 1 hour produce high quality data with extremely low background.


First users of Offspec

First users of Offspec. David Bucknall (Georgia Institute of Technology and Oxford University), Jinhyun Hannah Lee and Zamri Radzi (Oxford University) with Rob Dalgleish (ISIS) investigating hydrogels for their prospective rolein cleft pallet repair.
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Commissioning of the Sans2d beam line started in the summer of 2009 and has continued in parallel with an initial user program and development of new data reduction software. Recently, complex sample environment, such as shear, pressure and stopped-flow cells, has started to be used.

Micelle-vesicle transition

Stopped-flow kinetic data taken on Sans2d (collaboration with TU-Berlin). The data show a micelle-vesicle transition followed by an increas in vesicle monodispersity measured with 15s time resolution.
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LET has completed the commissioning of all seven disk choppers, and 4 detector panels out of the final detector complement of 12. The massive 4 m long detectors perform excellently with a 20 mm position resolution along the length and very low background noise. The first inelastic measurements, performed in May 2010, confirmed the top class performance in good agreement with simulations.

LET measurements of excitations

LET measurements of excitations in the Fe8 single molecule magnet demonstrating the instrumental resolution.
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Nimrod has been developed for atomic-resolution structural characterisation of liquid and disordered material systems on a single continuous measurement length scale up to tens of nanometres. The instrument is built around a pixellated small angle detector bank that consists of 756 neutron scintillation elements, fibre-coupled to an array of 120 photomultiplier tubes. This array covers scattering angles of 0.5°-2.2°, which in combination with the instrument’s wider angle detector modules, allow Nimrod to access a Q-range from 0.02Å-1 to 50Å-1 giving a structural resolution of 0.1Å out to length scales of 300Å. This performance is unique in the world.

Nimrod first users

Beau Webber (University of Kent, right) was the first user on Nimrod. He is seen here with Daniel Bowron and Alan Soper (ISIS) during their experiment to study the wall structure of pores in templated silcas.
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From the moment it received beam in June 2009, the Wish diffractometer started producing very high quality data. The high cold neutron flux, good Q-resolution and low background have already made an impact in the study of magnetic systems with weakly ordered moments which had not been resolved anywhere previously (as low as 0.1 µB) and routinely allow work on 100 mg samples. On larger samples, a collection time of minutes provides good statistics for Rietveld refinement. Wish is also used in areas such as hydrogen storage materials with large unit cells. The first experiment using the dedicated 14T cryomagnet gave excellent results, showing that the radial collimator eliminates the Al contamination in a wide angular range.

First Wish experiment

The team for the first Wish experiment. Roger Johnson and Tom Frawley (Durham University) working with Pascal Manuel and Dmitry Khalyavin, Wish instrument scientists, and Jeff Keeping and Richard Down of the ISIS user support group, to determine the magnetic structures of Er2CoGa8 and Tm2CoGa8.
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