Abstract
IN recent papers communicated at about the same date, one of us1 has reported a number of singlet band systems in the absorption spectrum of nitrogen in the extreme ultra-violet, while the other2 has given details of several singlet systems obtained in emission in the near ultra-violet. These two sets of systems do not have any electronic levels in common as they are of different symmetry, but unfortunately the same letters have been used by both of us in designating some of the electronic states.
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