The trajectory of states passed through by the nitrogen Hugoniot has been followed from the normal molecular liquid up to the dense plasma state near 10(6) GPa. A phase diagram is proposed that is very similar to one reported for phosphorous. The nitrogen phase diagram connects the recently observed molecular to cg-N polymer phase transition in the solid at 110 GPa, to a liquid-polymer phase line obtained from of shock cooling measurements. At much higher pressures, calculations of the Hugoniot predict that ionization of the tightly bound inner L and K electron shells lead to compression maxima of approximately 5-6 fold near 1000 GPa (T similar to 3.5 10(5) K) and 40 000 GPa (T similar to 2.3 10(6) K), respectively.
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