Proton Knight shift in the organic conductor (fluoranthenyl)2AsF6

Proton Knight shifts in the organic conductor (fluoranthenyl${)}_2$ ${\mathrm{AsF}}_6$ in the metallic phase have been determined from multiple-pulse NMR experiments. Two different inequivalent sites with dis- tinct hyperfine-tensor interactions due to conduction electrons were identified with $A_{11}^{\mathrm{}\left(1\right)\mathrm{}}$=-3 MHz, $A_{22}^{\mathrm{}\left(1\right)\mathrm{}}$=-11 MHz, $A_{33}^{\mathrm{}\left(1\right)\mathrm{}}$=-6 MHz; $A_{11}^{\mathrm{}\left(2\right)\mathrm{}}$=-1 MHz, $A_{22}^{\mathrm{}\left(2\right)\mathrm{}}$=-1 MHz, $A_{33}^{\mathrm{}\left(2\right)\mathrm{}}$=-9 MHz. These can be related to the spin-density distribution of the conduction electrons on the molecules. The conduction-band molecular orbital is shown to be strongly dominated by the fluoranthenyl molecular orbital.