Positron Annihilation Spectroscopy has been applied to study the physisorption of nitrogen on graphite surface.The Doppler broadening spectra have been measured as a function of the fractional monolayer coverage.The Doppler broadening S-parameter has a maximum at half monolayer.It is interpreted as a result of structural inhomogeneity(defect-type)created by the presence of nitrogen molecules on the graphite surface.
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