Nature of the Debye-Process in Monohydroxy Alcohols: 5-Methyl-2-Hexanol Investigated by Depolarized Light Scattering and Dielectric Spectroscopy

Jan Gabriel, Florian Pabst, Andreas Helbling, Till Böhmer, and Thomas Blochowicz
Phys. Rev. Lett. 121, 035501 – Published 16 July 2018
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Abstract

The slow Debye-like relaxation in the dielectric spectra of monohydroxy alcohols is a matter of long-standing debate. In the present Letter, we probe reorientational dynamics of 5-methyl-2-hexanol with dielectric spectroscopy and depolarized dynamic light scattering (DDLS) in the supercooled regime. While in a previous study of a primary alcohol no indication of the Debye peak in the DDLS spectra was found, we now for the first time report clear evidence of a Debye contribution in a monoalcohol in DDLS. A quantitative comparison between the dielectric and DDLS manifestation of the Debye peak reveals that while the dielectric Debye process represents fluctuations in the end-to-end vector dipole moment of the transient chains, its occurrence in DDLS shows a more local signature and is related to residual correlations that occur due to a slight anisotropy of the α relaxation caused by the chain formation.

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  • Received 16 January 2018
  • Revised 30 March 2018

DOI:https://doi.org/10.1103/PhysRevLett.121.035501

© 2018 American Physical Society

Physics Subject Headings (PhySH)

  1. Research Areas
Condensed Matter, Materials & Applied PhysicsPolymers & Soft Matter

Authors & Affiliations

Jan Gabriel*, Florian Pabst, Andreas Helbling, Till Böhmer, and Thomas Blochowicz

  • Institut für Festkörperphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany

  • *Jan.Gabriel@fkp.physik.tu-darmstadt.de
  • thomas.blochowicz@physik.tu-darmstadt.de

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Issue

Vol. 121, Iss. 3 — 20 July 2018

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