Neutrons and Neutron Spectroscopy

Neutron Scattering Studies of Heterogeneous Catalysis

“…The integrated spectral intensity is also directly proportional to the total neutron scattering cross section in the beam (in the case of hydrogenous material, it roughly scales with the amount of hydrogen). 28 Theoretically modeling is often required to analyze and understand the obtained INS spectrum. Neutron scattering shows the cumulative effect on the energies and numbers of the scattered neutrons of all collisions with the catalyst and any adsorbed species.…”

“…There have been some excellent reviews ,− and book chapters ,,− on the application of neutron scattering to heterogeneous catalysis. Most of these have focused on a single technique, especially INS, with limited comprehensive reviews , on various neutron techniques.…”

“…The scattered neutron may gain or lose energy (Figure ). The energy transferred from the neutron appears as the scatterer’s rotational, vibrational, or translational energy . The scattering can also be coherent or incoherent.…”

“…The energy transferred from the neutron appears as the scatterer's rotational, vibrational, or translational energy. 28 The scattering can also be coherent or incoherent. Incoherent scattering measures the correlation between the positions of an atom at time zero and at a later time, with each atom contributing independently to the total scattering by simple summation.…”

Exposing Key Vibrational Contributions to Properties of Organic Molecular Solids with High Signal, Low Frequency Neutron Spectroscopy and Ab Initio Simulations

“…Incoherent, inelastic neutron vibrational spectroscopy (INS) complements optical spectroscopy. INS is not subject to selection rules and reports directly on all mass-weighted atomic motions; together with the high cross section of hydrogen, it is ideal for studying dynamics of hydrogen bonds in condensed systems, and for large motions of hydrogenated molecules. , The next-generation VISION vibrational spectrometer at the Spallation Neutron Source user-facility at the Oak Ridge National Laboratory (ORNL), due to its design, can achieve a resolution of 0.5–2.0 (Δ E / E ) in the range 16–4000 cm –1 , while simultaneously providing excellent signal-to-noise ratio in the THz and FIR regions. − Measurements are performed at temperatures as low as 5 K. The high signal allows for adequate spectra to be collected in under an hour, creating the potential for high-throughput data collection and, subsequently, substantial data sets.…”