Determination of fractional dimension of low-dimensional solids by electron paramagnetic resonance

We propose a new concept of the determination of the fractional dimension o f low-dimensional solids by electron paramagnetic resonance (EPR). First, w e present the model and the theory for determining the fractional dimension by EPR. The line shapes of EPR for different fractional-dimensional solids were calculated. Second, we describe the result of the EPR measurement of polyaniline samples with different conductivity, and the determination of t he values of the dimension. This result is compared with that determined by the spectroscopic ellipsometry. (C) 2000 Elsevier Science Ltd. All rights reserved.