MERLIN has an m=3 supermirror guide to enhance flux as well as a massive π steradians of detector solid angle with an angular range from -45 to +135 degrees in the horizontal plane and ±30 degrees in the vertical plane. The detectors are 3m long position sensitive detectors placed in the tank vacuum to eliminate gaps in the coverage, making it ideal for both single crystal and powder/liquid users. The guide extends the dynamic range of the instrument allowing the study of excitations from a few meV to hundreds of meV.
PSDs make the instrument very versatile, being equally able to study single crystal samples as well as powders, liquids and amorphous materials. Its high count rates open up many fields including detailed parametric studies as a function of pressure, temperature and composition; studies of complex multi-component materials; novel materials for which only small quantities are available; experiments on
single crystals where the signals are weak or the crystals are small ;complete four dimensional mapping of the Brillouin zone and experiments involving the use of complex sample environments
Features include a non-magnetic sample tank and piezo-electric beam defining jaws so that high-field magnets may be used. A wider sample flange allows the use of larger pieces of sample environment equipment.
For examples of the kind of science that can be performed on the instrument have a look to the recently published articles:
Competing exchange interactions on the verge of a Metal-Insulator Transition in the two-dimensional spiral magnet Sr3Fe2O7, J.-H. Kim et al., Phys. Rev. Lett. 113, 147206 (2014)
Contour maps of spin-wave dispersions in Sr3Fe2O7 measured on PANDA, PUMA and MERLIN
Exotic magnetism on the Quasi-fcc Lattices of the d3 Double Perovskites La2NaB'O6 (B' = Ru, Os), A. A. Aczel et al., Phys. Rev. Lett. 112, 117603 (2014).
Exotic magnetism on Quasi-fcc lattices probed using inelastic neutron scattering
Doping dependence of spin-excitations and its correlations with high-temperature superconductivity in iron pnictides, M. Wang et al., Nature Comm. 4, 2874 (2013).
Spin excitations of doped BaFe2As2
Characterisation of hydrocarbonaceous overlayers important in metal-catalysed selective hydrogenation reactions, D. Lennon et al., Chem. Phys. 427, 49 (2013).
Direct geometry inelastic neutron scattering investigation of heterogenous catalysts