Zakład Fizyki Wysokich Ciśnień - publikacje

Abstract: Molecular dynamics of the solid 3-(trifluoromethyl) benzoic acid containing proton 1H and fluorine 19F nuclei was explored by the solid-state NMR off - resonance technique. Contrary to the previous experiments the proton nuclei system I relaxed in the off - resonance effective field B→e while fluorine nuclei system S was saturated for short time in comparison to the relaxation time T1I. New cross - relaxation solid - state NMR off - resonance experiments were conducted on a homebuilt pulse spectrometer operating at the on-resonance frequency of 30.2 MHz, at the off - resonance frequency varied between 30.2 and 30.6 MHz for protons and at the frequency of 28.411 MHz for fluorines, respectively. Based on the experimental data the dispersions of the proton off - resonance spin - lattice relaxation rate ρρ I, the fluorine off - resonance spin - lattice relaxation rate ρρ S and the cross - relaxation rate σρ in the rotating frame were determined. © 2016 Elsevier Inc.