Structure of the Infrared Y Bands of N2

Abstract

The rotational analysis of the n+4, 3 band of the ``Y'' system of N₂ shows that the initial state is a ³Σ_u^— level with B_n+4 = 1.3325. The band has exactly the structure to be expected from a ³Σ_u^—→³II_g transition and all expected 27 branches have been observed. The triplet separation of the ³Σ state degenerates into a doublet for all but the lowest values of K as the two states with J = K±1 nearly coincide.