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The slow Debye-like relaxation in the dielectric spectra of monohydroxyalcohols is a matter of long standing debate. In the present work, we probereorientational dynamics of 5-methyl-2-hexanol with dielectric spectroscopy anddepolarized light scattering (DDLS) in the supercooled regime. While in aprevious study of a primary alcohol no indication of the Debye peak in the DDLSspectra was found, we now for the first time report clear evidence of a Debyecontribution in a monoalcohol in DDLS. A quantitative comparison between thedielectric and DDLS manifestation of the Debye peak reveals that while thedielectric Debye process represents fluctuations in the end-to-end vectordipole moment of the transient chains, its occurrence in DDLS shows a morelocal signature and is related to residual correlations which occur due to aslight anisotropy of the $\alpha$-relaxation caused by the chain formation.

physical review letters

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