Time-scale ordering in hydrogen- and van der Waals-bonded liquids

The coupling behavior of time scales structural relaxation is investigated on the basis five different response functions for 1,2,6-hexanetriol, a hydrogen-bonded liquid with minor secondary contribution, and 2,6,10,15,19,23-hexamethyl-tetracosane (squalane), van der Waals bonded prominent process. Time are derived as inverse peak frequencies each function. For time-scale indices temperature-independent, while decoupling observed squalane in accordance literature. An alternative evaluation approach made data, extracting from terminal mode instead position, this case temperature-independent also found squalane, despite its strong contribution. Interestingly, very same ordering response-function-specific these two liquids, which consistent observation simple liquids reported previously [Jakobsen \textit{et al.}, J. Chem. Phys. \textbf{136}, 081102 (2012)]. This based following functions, fast to slow dynamics: shear modulus, bulk dielectric permittivity, longitudinal thermal expansivity coefficient, specific heat. These findings indicate general relation between and, inter-molecuar interactions apparently play subordinate role, suggest rather generic nature process relaxation.