Sample dependence of anisotropy and restriction of electron-spin diffusion in the quasi-one dimensional organic conductor (fluoranthene)<InlineEquation ID="Equ1"> <EquationSource Format="TEX">$\mathsf{_2}$</EquationSource> </InlineEquation>PF<InlineEquation ID="Equ2"> <EquationSource Format="TEX">$\mathsf{_6}$</EquationSource> </InlineEquation>

As-grown and proton-irradiation damaged crystals of the quasi-one dimensional organic conductor (fluoranthene)<Subscript>2</Subscript>PF<Subscript>6</Subscript> are studied by static magnetic field gradient spin echo electron spin resonance. The parallel-to-stack diffusion constant <InlineEquation ID="Equ3"> <EquationSource Format="TEX">$D_{\parallel}$</EquationSource> </InlineEquation> varies sample dependent by a factor of 50, just like the ratio <InlineEquation ID="Equ4"> <EquationSource Format="TEX">$D_{\parallel}/D_{\bot}$</EquationSource> </InlineEquation>. The restriction of free diffusive motion of the conduction electron spins of as-grown and microstructured crystals is analyzed. Copyright Springer-Verlag Berlin/Heidelberg 2003