title: High-contrast sub-millivolt inelastic X-ray scattering for nano- and mesoscale science.
abstract: Photon and neutron inelastic scattering spectrometers are microscopes for imaging condensed matter dynamics on very small length and time scales. Inelastic X-ray scattering permitted the first quantitative studies of picosecond nanoscale dynamics in disordered systems almost 20 years ago. However, the nature of the liquid-glass transition still remains one of the great unsolved problems in condensed matter physics. It calls for studies at hitherto inaccessible time and length scales, and therefore for substantial improvements in the spectral and momentum resolution of the inelastic X-ray scattering spectrometers along with a major enhancement in spectral contrast. Here we report a conceptually new spectrometer featuring a spectral resolution function with steep, almost Gaussian tails, sub-meV (≃620 μeV) bandwidth and improved momentum resolution. The spectrometer opens up uncharted space on the dynamics landscape. New results are presented on the dynamics of liquid glycerol, in the regime that has become accessible with the novel spectrometer.
authors: Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA.
authors: Yuri
authors: Y
authors: Shvyd'ko
authors: Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA.
authors: Stanislav
authors: S
authors: Stoupin
authors: Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA.
authors: Deming
authors: D
authors: Shu
authors: Diamond Light Source Ltd, Didcot, Oxfordshire OX11 0DE, UK.
authors: Stephen P
authors: SP
authors: Collins
authors: Diamond Light Source Ltd, Didcot, Oxfordshire OX11 0DE, UK.
authors: Kiran
authors: K
authors: Mundboth
authors: Diamond Light Source Ltd, Didcot, Oxfordshire OX11 0DE, UK.
authors: John
authors: J
authors: Sutter
authors: DESY, Notkestrasse 85, 22607 Hamburg, Germany.
authors: Martin
authors: M
authors: Tolkiehn