Abstract
Five new systems due to N
2
have been observed in a mildly condensed discharge through nitrogen. Rotational analyses of some of the bands have been made, and it is shown that all correspond to transitions to the
a
1
Π
u
upper level of the Lyman-Birge-Hopfield System. An additional progression of the system studied by Van der Ziel, here referred to as the Fifth Positive System, has been found, necessitating a revision of the upper vibrational quantum numbers. Some of Kaplan’s systems have also been examined, and the rotational analysis of one shows that it corresponds to a transition to the lower level of the Fifth Positive System. This level very probably lies a little below
a
1
Π
u
and must therefore be metastable; it may play an important part in the formation of active nitrogen. The rotational and vibrational constants for the singlet electronic states of N
2
are tabulated.
Reference15 articles.
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