title: Capturing the Ultrafast Vibrational Decoherence of Hydrogen Bonding in Interfacial Water.
abstract: Vibrational sum-frequency generation (vSFG) measurements in the frequency and time domains reveal that the interfacial hydrogen bonded OH stretch at the water/calcium fluoride interface is composed of two populations oriented oppositely. The time-resolved vSFG free-induction decay suggested that, whereas the strongly hydrogen bonded OH vibrational stretches, centered near 3140 ± 11 cm-1, are oriented toward bulk water and lose their collective coherence within ∼70 ± 7 fs, the weakly hydrogen bonded OH species, centered near 3410 ± 12 cm-1, are pointed toward the interface and dephase within ∼50 ± 6 fs.
authors.affiliation: Department of Chemistry, Temple University , 1901 North 13th Street, Philadelphia, Pennsylvania 19122, United States.
authors.forename: Abdelaziz
authors.identifier: http://orcid.org/0000-0003-4519-4403
authors.initials: A
authors.lastname: Boulesbaa
authors.affiliation: Department of Chemistry, Temple University , 1901 North 13th Street, Philadelphia, Pennsylvania 19122, United States.
authors.forename: Eric
authors.initials: E
authors.lastname: Borguet