title: Ergodic to nonergodic transition in liquids with a local order: the case of m-toluidine.
abstract: The dynamic structure factor of m-toluidine has been measured by inelastic x-ray scattering in the mesoscopic Q range between 1 and 10 nm(-1), where a prepeak is revealed in the static structure factor resulting from the existence of hydrogen bonded, nanometer size clusters. Evidence is given of (i) a square-root cusp in the nonergodicity factor and of (ii) critical nonergodicity parameters which oscillate in phase with the static structure factor. These results demonstrate that local order in a liquid can coexist with the signatures of the ergodic to nonergodic transition predicted by the mode coupling theory for simple, dense liquids.
authors.affiliation: INFM CRS-SOFT, c/o Universitá di Roma La Sapienza, P. A. Moro 2, I-00185 Roma, Italy.
authors.forename: L
authors.initials: L
authors.lastname: Comez
authors.forename: S
authors.initials: S
authors.lastname: Corezzi
authors.forename: G
authors.initials: G
authors.lastname: Monaco
authors.forename: R
authors.initials: R
authors.lastname: Verbeni
authors.forename: D
authors.initials: D
authors.lastname: Fioretto