Super-resolution energy spectra from neutron direct-geometry spectrometers

Abstract

Neutron direct-geometry time-of-flight chopper spectroscopy is instrumental in studying fundamental excitations of vibrational and/or magnetic origin. We report here that techniques in super-resolution optical imagery (which is in real-space) can be adapted to enhance resolution and reduce noise for a neutron spectroscopy (an instrument for mapping excitations in reciprocal space). The procedure to reconstruct super-resolution energy spectra of phonon density of states relies on a realization of multi-frame registration, accurate determination of the energy-dependent point spread function, asymmetric nature of instrument resolution broadening, and iterative reconstructions. Applying these methods to phonon density of states data for a graphite sample demonstrates contrast enhancement, noise reduction, and ~5-fold improvement over nominal energy resolution. The data were collected at three different incident energies measured at the Wide Angular-Range Chopper Spectrometer at the Spallation Neutron Source.

References in corpus (9)

• Mantid - Data Analysis and Visualization Package for Neutron Scattering and $\mu SR$ Experiments
• The new Cold Neutron Chopper Spectrometer at the Spallation Neutron Source - Design and Performance
• Phonon Density-of-States in MgB2
• A nuclear quantum effect with pure anharmonicity and the anomalous thermal expansion of silicon
• The role of the lattice in the $\gamma \to \alpha$ phase transition of Ce: a high pressure neutron and x-ray diffraction study
• MCViNE -- An object oriented Monte Carlo neutron ray tracing simulation package
• Electron-phonon coupling in the conventional superconductor YNi${}_2$B${}_2$C at high phonon energies studied by time-of-flight neutron spectroscopy
• Unusual phonon density of states and response to the superconducting transition in the In-doped topological crystalline insulator Pb${}_{0.5}$Sn${}_{0.5}$Te
• Momentum and Energy Dependent Resolution Function of the ARCS Neutron Chopper Spectrometer at High Momentum Transfer: Comparing Simulation and Experimen

Cited by in corpus (1)

• Interpretable, calibrated neural networks for analysis and understanding of inelastic neutron scattering data