Absorption spectrum of gaseous 80Se2 in 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,1_g 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,1_uâ†�X,1_g; the fourth band is much weaker, and arises from a transition from X,0⁺_g to the same upper state, C,1_u. The ground state interval, X(1_g–0⁺_g), is 366.6 cm^–1 for v= 0.