Absorption spectrum of gaseous⁸⁰Se₂in the region 51500–55000 cm^–1

Abstract

Absorption bands of gaseous 80Se2 in the region 51500–55 000 cm–1 have been photographed under high resolution. All the bands are degraded to shorter wavelengths and arise from transitions from the ground states X,0+g and X,1g to the lowest lying Rydberg states. Many of the bands are predissociated, but the structure of four bands is sufficiently sharp for rotational analysis. One is the 0-0 band of a 0+gâ†�X,0+g system : two prove to be the 1–0 and 0-0 bands of a transition C,1uâ†�X,1g; the fourth band is much weaker, and arises from a transition from X,0+g to the same upper state, C,1u. The ground state interval, X(1g–0+g), is 366.6 cm–1 for v= 0.