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We have observed narrow, distinct resonances in the NMR spectrum of dilute spinpolarized atomic hydrogen gas (n-10' atoms/cm'). The dependence of the observed spectra on temperature, density, polarization, and magnetic field gradient is consistent with theoretical predictions for spin-wave excitations damped by diffusion. We have measured the parameter p, , which is a measure of the importance of exchange effects in spin-transport processes, and the diffusion coefficient Do, both of which are in reasonable agreement with theory.

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