Quasielastic neutron scattering characterization of the relaxation processes in a room temperature ionic liquid

Alessandro Triolo, Olga Russina, Valeria Arrighi, Fanni Juranyi, Stefan Janssen, Charles M. Gordon

Research output: Contribution to journalArticle

106 Citations (Scopus)

Abstract

We report the first quasielastic neutron scatteringmeasurements on a room temperature ionic liquid: 1-n-butyl-3-methylimidazolium hexafluorophosphate, [bmim][PF6]. Data were collected using a medium resolution spectrometer as a function of temperature in the range 250–320 K. The data unequivocally indicate the existence of two different relaxation processes: a fast, localized motion occurring in the subpicosecond range and a slower process spanning the subnanosecond regime. These results provide experimental support to recently published molecular dynamics simulations. Evidence for slower, unresolved dynamics (under the present experimental conditions) is also obtained. Both temperature and momentum transfer dependence of the intermediate incoherent dynamic structure factor were investigated, after Fourier transformation into the temporal domain. The fast process shows no appreciable Q- and T-dependence. On the other hand the slow process shows evidence of a complex, non-Debye and non-Arrhenius behavior.
Original languageEnglish
Pages (from-to)8549-8557
Number of pages9
JournalJournal of Chemical Physics
Volume119
Issue number16
DOIs
Publication statusPublished - 22 Oct 2003

Fingerprint Dive into the research topics of 'Quasielastic neutron scattering characterization of the relaxation processes in a room temperature ionic liquid'. Together they form a unique fingerprint.

Cite this