Abstract
The trace of the magnetic susceptibility of carbon fibers has been calculated assuming the structural model of very long, longitudinally folded, monolayer ribbons of graphite. The method used was based upon the London Hamiltonian. The results depend most strongly upon the width of the ribbon, the tightness of folding, and the distance between folds. If the latter quantity is determined by X-ray diffraction or electron microscopy, the experimental data for magnetic susceptibility versus temperature can be used to determine the first two quantities. For presently available data, true widths of the ribbons range between 270 and 400Å, and the folding produces apparent widths of between 0.5 and 0.85 of the true widths.
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