Assertion: solid nitrogen | /r/HasProperty | irradiated by high speed protons
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Source sentences:
text: When solid nitrogen is irradiated by high speed protons or electrons, several reactive radicals are formed, including atomic nitrogen (N), nitrogen cations (N+), dinitrogen cation (N 2 +), trinitrogen radicals (N 3 and N 3 +), and azide (N 3 −).