Pure rotational Raman spectrum of fluorine

Abstract

The pure rotational Raman spectrum of ¹⁹F₂ has been recorded photographically with a reciprocal linear dispersion of 1.4 cm^–1 mm^–1 and analysed to yield; B₀= 0.883 31 ± 0.000 04 cm^–1; 10⁶D₀= 3.48 ± 0.06 cm^–1; r₀= 1.417 44 ± 0.000 06 Å. Assuming from earlier work, B₁= 0.872 ± 0.002 cm^–1, the following equilibrium constants were obtained; B_e= 0.889 ± 0.001 cm^–1; r_e= 1.4131 ± 0.000 8 Å.

These are the most precise values yet reported for B₀, D₀ and r₀, r_e of ¹⁹F₂. The experimentally determined D₀ value is in good agreement with the value calculated from B₀ and ω₀.