THE ABSORPTION SPECTRUM OF CF2

Abstract

The absorption spectrum of CF₂ in the 2 500 Å region has been photographed at high dispersion, and the rotational structure of a number of bands has been analyzed. The analysis of the well-resolved subbands establishes that these are perpendicular- rather than parallel-type bands, as previously assigned. Further analysis shows that the upper and lower electronic states are of ¹B₁ and ¹A₁symmetries respectively, corresponding to a transition moment that is perpendicular to the plane of the molecule. In the upper electronic state, r₀(CF) = 1.32 Å and , while in the ground state, r₀(CF) = 1.300 Å and . An investigation of the vibrational structure of the band system has shown that the vibrational numbering in ν₂′ must be increased by one unit from earlier assignments, thus placing the 000–000 band near 2 687 Å (37 220 cm⁻¹). A search between 1 300 and 8 500 Å showed two new band systems near 1 350 and 1 500 Å which have been assigned tentatively to the CF₂ molecule.