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• W4385442022 abstract "We investigate the reorientation dynamics of four octanol isomers with very different characteristics regarding the formation of hydrogen-bonded structures by means of photon-correlation spectroscopy (PCS) and broadband dielectric spectroscopy. PCS is largely insensitive to orientational cross-correlations and straightforwardly probes the α-process dynamics, thus allowing us to disentangle the complex dielectric relaxation spectra. The analysis reveals an additional dielectric relaxation contribution on time scales between the structural α-process and the Debye process. In line with nuclear magnetic resonance results from the literature and recent findings from rheology experiments, we attribute this intermediate contribution to the dielectric signature of the O-H bond reorientation. Due to being incorporated into hydrogen-bonded suprastructures, the O-H bond dynamically decouples from the rest of the molecule. The relative relaxation strength of the resulting intermediate contribution depends on the respective position of the hydroxy group within the molecule and seems to vanish at sufficiently high temperatures, i.e., exactly when the overall tendency to form hydrogen bonded structures decreases. Furthermore, the fact that different octanol isomers share the same dipole density allows us to perform an in-depth analysis of how dipolar cross-correlations appear in dielectric loss spectra. We find that dipolar cross-correlations are not solely manifested by the presence of the slow Debye process but also scale the relaxation strength of the self-correlation contribution depending on the Kirkwood factor." @default.
• W4385442022 created "2023-08-02" @default.
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• W4385442022 date "2023-08-01" @default.
• W4385442022 modified "2023-10-17" @default.
• W4385442022 title "Revealing complex relaxation behavior of monohydroxy alcohols in a series of octanol isomers" @default.
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• W4385442022 doi "https://doi.org/10.1063/5.0160894" @default.
• W4385442022 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/37526166" @default.
• W4385442022 hasPublicationYear "2023" @default.
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