ISIS Neutron and Muon Source Data Journal
This is a page describing data taken during an experiment at the ISIS Neutron and Muon Source. Information about the ISIS Neutron and Muon Source can be found at https://www.isis.stfc.ac.uk.
Separation of the coherent and incoherent scattering components for 1-propanol to separate collective and individual dynamics.
Abstract: Hydrogen bonding governs the microscopic dynamics of monohydroxy alcohols such as 1-propanol, yet the origin of their distinct relaxation processes, whether collective or single-molecule, remains unresolved. Dielectric and optical spectroscopy distinguish the structural -relaxation and the slower, hydrogen-bond driven Debye relaxation, but cannot determine their microscopic nature. Neutron scattering can make this distinction: incoherent scattering reflects self-dynamics, while coherent scattering reveals collective fluctuations. Building on recent polarized QENS studies on water (Arbe et al.), which directly separated coherent and incoherent contributions, we propose to apply this approach to 1-propanol. Using the LET@ISIS spectrometer with polarization analysis and selective deuteration, we will map the Q-dependence at the pre-peak (~0.7A-1 ) and main peak (~1.4A-1 ) of the structure factor. This will determine whether the slow Debye process arises from collective hydrogen-bond fluctuations or individual molecular motions, providing the first direct decomposition of coherent and incoherent dynamics in 1-propanol and linking macroscopic dielectric behavior to microscopic mechanisms.
Principal Investigator: Mr Anand Kumar Tiwari
Local Contact: Dr Ross Stewart
Experimenter: Professor Kristine Niss
Experimenter: Dr Markus Appel
Experimenter: Dr Bela Farago
Experimenter: Dr Miguel Angel Gonzalez
DOI: 10.5286/ISIS.E.RB2610382
ISIS Experiment Number: RB2610382
| Part DOI | Instrument | Public release date | Download Link |
|---|---|---|---|
| 10.5286/ISIS.E.RB2610382-1 | LET | 13 May 2029 | Download |
Publisher: STFC ISIS Neutron and Muon Source
Data format: RAW/Nexus
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Data Citation
The recommended format for citing this dataset in a research
publication is as:
[author], [date], [title], [publisher],
[doi]
For Example:
Mr Anand Kumar Tiwari et al; (2026): Separation of the coherent and incoherent scattering components for 1-propanol to separate collective and individual dynamics., STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB2610382
Data is released under the CC-BY-4.0 license.
