The B ¹∑⁺ and X¹∑⁺ electronic states of hydrogen fluoride: A direct potential fit analysis

All literature pure rotational and vibration-rotational spectroscopic data on the ground X ¹∑⁺ electronic state of HF and DF, together with the entire set of spectroscopic line positions from analyses of the B ¹∑⁺ → X ¹∑⁺ emission band systems of HF and DF, have been used in a global least-squares fit to the radial Hamiltonian operators, in compact analytic form, for both electronic states. With a data set consisting of 6157 spectroscopic line positions, the reduced standard deviation of the fit was σ̂ = 1.028. Sets of quantum mechanically significant rotational and centrifugal distortion constants were calculated for both electronic states using Rayleigh- Schrödinger perturbation theory.