Solvent response and dielectric relaxation in supercooled butyronitrile

Naoki Ito, Kalyan Duvvuri, Dmitry Matyushov, Ranko Richert

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

We have measured the dynamics of solvation of a triplet state probe, quinoxaline, in the glass-forming dipolar liquid butyronitrile near its glass transition temperature T 8=95 K. The Stokes shift correlation function displays a relaxation time dispersion of considerable magnitude and the optical linewidth changes along the solvation coordinate in a nonmonotonic fashion. These features are characteristic of solvation in viscous solvents and clearly indicate heterogeneous dynamics, i.e., spatially distinct solvent response times. Using the dielectric relaxation data of viscous butyronitrile as input, a microscopic model of dipolar solvation captures the relaxation time, the relaxation dispersion, and the amplitude of the dynamical Stokes shift remarkably well.

Original languageEnglish (US)
Article number024504
JournalJournal of Chemical Physics
Volume125
Issue number2
DOIs
StatePublished - 2006

Fingerprint

Dielectric relaxation
Solvation
solvation
Relaxation time
relaxation time
quinoxalines
Quinoxalines
shift
Linewidth
glass transition temperature
atomic energy levels
Glass
probes
glass
Liquids
liquids

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Solvent response and dielectric relaxation in supercooled butyronitrile. / Ito, Naoki; Duvvuri, Kalyan; Matyushov, Dmitry; Richert, Ranko.

In: Journal of Chemical Physics, Vol. 125, No. 2, 024504, 2006.

Research output: Contribution to journalArticle

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