Abstract
Multiple spin echos can be excited for spin-1/2 systems by two radiofrequency pulses with tipping angles unequal to 180°, if the absolute magnetization is sufficiently large. If a magnetic field gradient is applied, the attenuation of the primary echo reveals the diffusion constant of these spins, whereas the ratio of primary and secondary echo amplitudes indicates the absolute magnetic susceptibility of the resonating spins. This potentiality is examined here numerically and by application of nuclear magnetic resonance to liquid samples containing protons. We analyse the complications that have to be overcome, if this technique is used for the study of the charge and spin carriers in low-symmetry quasi-one-dimensional organic conductors. Reasonable accuracy is obtained for the parameters derived for the conduction electrons of perylene radical cation salts.
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