Mar 20 – 23, 2023
Campus Garching
Europe/Berlin timezone

Coherent and Incoherent Scattering of Tetrahydrofuran from Meso- to Inter-molecular Scales by Neutron Spectroscopy with Polarization Analysis and Spin Echo

Mar 21, 2023, 4:00 PM
2h
Yards 4 - 6 (Fakultät für Maschinenwesen)

Yards 4 - 6

Fakultät für Maschinenwesen

Board: TU-008
Poster Glasses and Liquids Poster session TUESDAY

Speaker

Arantxa Arbe (Centro de Fisica de Materiales CSIC-UPV/EHU)

Description

We have extended our previous investigations on self- and collective dynamics of liquid water [1,2] to the case of tetrahydrofuran (THF). Neutron polarization analysis on a wide-angle time-of-flight spectrometer (PLET @ ISIS) has allowed measuring separately coherent and incoherent dynamic structure factor of deuterated THF with sub-meV resolution in a wide scattering vector (Q) range. The combination with Neutron Spin Echo (WASP @ ILL) experiments on deuterated and protonated THF with higher resolution has allowed to fully characterize the contributions to self- and collective dynamic structure factors also at low temperature. Interestingly, a low-Q mode (independent of Q), as that discerned in the collective dynamics of water and attributed to the reorganization of the HB-network, is also found in THF. The activation energy is however much lower, suggesting van der Waals interactions at the nature of the underlying process in this low-Q mode for the case of THF.

References
[1] A. Arbe, P. Malo de Molina, F. Alvarez, B. Frick, and J. Colmenero, Physical Review Letters 117, 185501 (2016).
[2] A. Arbe, G. Nilsen, J. R. Stewart, F. Alvarez, V. García-Sakai and J. Colmenero, Physical Review Research 2, 022015 (2020).

Primary author

Arantxa Arbe (Centro de Fisica de Materiales CSIC-UPV/EHU)

Co-authors

Bela Farago (ILL) Prof. Fernando Alvarez (dUniversidad del País Vasco-Euskal Herriko Unibertsitatea (UPV/EHU)) Dr Gøran Nilsen (ISIS Neutron and Muon Source) Juan Colmenero (Centro de Fisica de Materiales CSIC-UPV/EHU)

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