title: The viscosity and temperature dependence of X-band ESR lineshapes of Gd(III) aqueous complex.
abstract: X-band ESR spectra of Gd-aqua complex in various weight concentration of glycerol have been recorded at four temperatures. The interpretation of the ESR linewidth is preformed using both the stochastic Liouville approach (SLA) and a perturbation theory. The SLA uses a one dynamic model of the zero-field splitting whereas the perturbation approach uses a two dynamic model. Both models can reproduce the variation of the linewidth with respect to viscosity. In the SLA model, both the zero-field splitting (ZFS) interaction and the correlation time vary with the glycerol content. In the two dynamic perturbation model, only the correlation times are viscosity dependent. The two models give different NMRD profiles.
authors.affiliation: Department of Bio-Physical Chemistry, Umeå University, SE-901 87 Umeå, Sweden.
authors.forename: Xiangzhi
authors.initials: X
authors.lastname: Zhou
authors.forename: Per-Olof
authors.initials: PO
authors.lastname: Westlund
mesh_terms: D004578:Electron Spin Resonance Spectroscopy / Q000379:methods*; D005682:Gadolinium / Q000737:chemistry*; D005990:Glycerol / Q000737:chemistry*; D013816:Thermodynamics; D014783:Viscosity; D014867:Water
chemical_list: D014867:Water; D005682:Gadolinium; D005990:Glycerol