Collective dynamics of liquid sulfur scrutinized over three decades in frequency

Demmel, F.; Jiménez‐Ruiz, Mónica

doi:10.1103/physreve.106.014606

Cited by 1 publication

(2 citation statements)

References 73 publications

(107 reference statements)

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“…However, this is out of the time scale covered by IXS. For this case, the information obtained by INS is effective, and the slow viscoelastic time of 10-30 ps obtained by Demmel and Jimenez-Ruiz [34] may reflect such a very slow relaxation time in the ring phase.…”

Section: Discussionmentioning

confidence: 84%

“…Recently, Demmel and Jimenez-Ruiz [34] have performed another INS experiment on liquid sulphur below T λ of 127 • C. The obtained INS data were analysed using a similar GLF with two viscoelastic relaxations in the memory function. An enhancement of about 50% from the hydrodynamic behaviour was also observed in acoustic phonon excitation energies.…”

Section: Introductionmentioning

confidence: 99%

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Collective dynamics of liquid sulphur across the polymerisation transition temperature probed by inelastic x-ray scattering

Hosokawa,

Katayama,

Tsutsui

et al. 2024

J. Phys.: Condens. Matter

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Inelastic x-ray scattering (IXS) experiments on liquid sulphur were carried out below (140◦C) and above (180◦C) the polymerisation temperature Tλ of about 159◦C to investigate changes in the collective dynamics of this unique liquid, that exhibits a liquid‒liquid transition. As reported earlier, broad longitudinal acoustic excitation signals were observed at both temperatures, and only the width of the quasielastic peaks slightly decreased when the temperature crossed the transition temperature. A model analysis was performed using a generalised Langevin formalism with a memory function having one thermal and two viscoelastic decay channels with the help of simple sparse modelling, and large positive deviations from the hydrodynamic sound velocity by 51‒54% were observed. The fast viscoelastic relaxation time τµis close to the correlation times of intermolecular stretching and bending motions of local sulphur connections in both ring and chain structures, and is similar to those of other molecular liquids. The small contrasts in the IXS spectra across the λ transition result in large changes in only the slow viscoelastic decay time τα of the memory function. The τα value at 140◦C matches the mixed internal/external torsional modes of S8 molecules well, whereas that at 180◦C has no corresponding molecular motion mode. The kinematic viscosity values at thesmaller than the minimum values of macroscopic shear viscosity, in⃗dicating that largeQ 0 limit are much changes in relaxation dynamics are expected with Q in the GHz and MHz excitation regimes.

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Section: Discussionmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Collective dynamics of liquid sulphur across the polymerisation transition temperature probed by inelastic x-ray scattering

Hosokawa,

Katayama,

Tsutsui

et al. 2024

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

show abstract

Collective dynamics of liquid sulfur scrutinized over three decades in frequency

Abstract: This is a copy of the published version, or version of record, available on the publisher's website. This version does not track changes, errata, or withdrawals on the publisher's site.

Cited by 1 publication

References 73 publications

Collective dynamics of liquid sulphur across the polymerisation transition temperature probed by inelastic x-ray scattering

Collective dynamics of liquid sulphur across the polymerisation transition temperature probed by inelastic x-ray scattering

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