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1. Nitrogen Molecules

   Linked via "vacuum studies"

   Atmospheric Interactions
   When subjected to high-energy excitation, such as in electrical discharge or in collisions with energetic particles in the upper atmosphere (as observed in auroras), $\text{N}_2$ molecules can fluoresce, albeit weakly compared to molecular oxygen. The characteristic emission lines produced during auroral events are concentrated in the deep [violet](/entries/viole…