RESTRICTED ELECTRON MOTION IN A ONE-DIMENSIONAL ORGANIC CONDUCTOR - PULSED-GRADIENT SPIN-ECHO ESR IN (FLUOROANTHENE)(2)PF6

The pulsed-gradient spin-echo electron spin resonance method has been used to measure the restricted diffusion of electrons along fluoranthe ne channels in the quasi-one-dimensional organic conductor (fluoroanth ene)(2)PF6. This type of experiment allows one to measure the echo att enuation both as a function of diffusional observation time Delta and effective scattering wave-vector amplitude q. In these experiments Del ta was varied between 10 and 20 mu s, while q values of up to 2.5 X 10 (4) m(-1) were employed, enabling dynamic spatial resolution on the mi cron scale. The echo attenuation data are broadly characteristic of on e-dimensional electron diffusion within the confines of an ensemble of wells, in which the well dimension l is characterized by a distributi on p(l)=(l) over bar l(-2)exp(l/(l) over bar). Subtle deviations in th is behavior can be modeled both by allowing for relaxation effects at the well boundaries, or by allowing for weak boundary permeability.