Heterogeneous relaxation patterns in supercooled liquids studied by solvation dynamics

Hauke Wendt, Ranko Richert

Research output: Contribution to journalArticle

55 Citations (Scopus)

Abstract

We have measured the solvation dynamics of a dipolar supercooled liquid near its glass transition in a temperature range in which the average structural relaxation time varies more than four orders of magnitude. The analysis of the time dependent average emission energy and the inhomogeneous linewidth of the S0 ←T1(0-0) transition reveals that the orientation correlation decay pattern intrinsic in each relaxing unit is associated with a stretching exponent βintr=1.00±0.08 in the entire range T8≤T≤T8 + 6 K. Our analysis also allows one to detect fluctuations in terms of the resulting apparent homogeneity within the long time tail of the decay. Even at times significantly exceeding the average structural relaxation time, no sign of a transition towards purely exponential or otherwise homogeneous behavior could be observed. This implies that even at t≈50〈τ〉KWW the individual time constants remain correlated to their initial values at t=0.

Original languageEnglish (US)
Pages (from-to)1722-1728
Number of pages7
JournalPhysical Review E - Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
Volume61
Issue number2
StatePublished - Feb 2000

Fingerprint

Supercooled Liquid
solvation
Relaxation Time
liquids
relaxation time
Decay
Long-time Tails
Glass Transition
Linewidth
decay
Time Constant
Homogeneity
Range of data
time constant
homogeneity
Exponent
Entire
Vary
exponents
Fluctuations

ASJC Scopus subject areas

  • Mathematical Physics
  • Physics and Astronomy(all)
  • Condensed Matter Physics
  • Statistical and Nonlinear Physics
  • Statistics and Probability

Cite this

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AB - We have measured the solvation dynamics of a dipolar supercooled liquid near its glass transition in a temperature range in which the average structural relaxation time varies more than four orders of magnitude. The analysis of the time dependent average emission energy and the inhomogeneous linewidth of the S0 ←T1(0-0) transition reveals that the orientation correlation decay pattern intrinsic in each relaxing unit is associated with a stretching exponent βintr=1.00±0.08 in the entire range T8≤T≤T8 + 6 K. Our analysis also allows one to detect fluctuations in terms of the resulting apparent homogeneity within the long time tail of the decay. Even at times significantly exceeding the average structural relaxation time, no sign of a transition towards purely exponential or otherwise homogeneous behavior could be observed. This implies that even at t≈50〈τ〉KWW the individual time constants remain correlated to their initial values at t=0.

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