Nuclear Magnetic Resonance in Paramagnetic FeF2

Abstract

A nuclear magnetic resonance study of the ${\mathrm{F}}^{19}$ resonance in paramagnetic Fe${\mathrm{F}}_2$ is reported. The hyperfine interactions with the magnetic electrons are measured and shown to be important in determining the resonance properties. The isotropic hyperfine interaction indicates the presence of (0.46±0.03)% unpaired $2s$ spins in ${\mathrm{F}}^{-}$ orbitals from each ${\mathrm{Fe}}^{++}$ ion neighbor.