The 2491 Å electronic transition of nitrogen dioxide I. Rotational analysis

Abstract

The 2491 Å electronic transition of nitrogen dioxide has been photographed in absorption under high resolution and a rotational analysis of the (000) ← (000) band carried out. The analysis is consistent with the upper state belonging to the C 2v point group and having 2 B 2 electronic symmety with an N—O length of 1·314 Å and an ONO angle of 121°2'. The N—O length is considerably greater than the ground-state value of 1·197 Å and the ONO angle is somewhat less than the ground-state value of 134° 15'.