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Two photon absorption laser-induced fluorescence is used to make measurements of atomic nitrogen density in nanosecond tube discharges under different conditions of specific energy deposition. The data reveals that the atomic nitrogen dissociation fraction is a strong function of this energy loading (measured in electronvolts per molecule or eV/mol), ranging from a few tenths to hundredths of a percent for 10-3 eV/mol to more than 10% for around 2 eV/mol.