title: High-order spin diffusion mechanisms in (19)F 2-D NMR of oxyfluorides.
abstract: Negative cross-peaks have been observed in the (19)F 2-D magnetization-exchange MAS NMR spectra of Ba(2)MoO(3)F(4) under fast-spinning conditions. The polarization transfer dynamics are studied as a function of the spinning frequency and the frequency separation of the resonances. The results are consistent with a novel mechanism, in which four spins simultaneously exchange Zeeman magnetization with each other, in an energy-conserving process.
authors.affiliation: Department of Chemistry, SUNY Stony Brook, Stony Brook, New York 11794-3400, USA.
authors.forename: L S
authors.initials: LS
authors.lastname: Du
authors.forename: M H
authors.initials: MH
authors.lastname: Levitt
authors.forename: C P
authors.initials: CP
authors.lastname: Grey
mesh_terms: D055598:Chemical Phenomena; D015392:Chemistry, Inorganic; D005459:Fluorides / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D008433:Mathematics; D015394:Molecular Structure; D008982:Molybdenum / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry*
chemical_list: D008982:Molybdenum; D005459:Fluorides; D010100:Oxygen