The electronic spectrum of hydrogen fluoride (7–46 eV)

The electron energy loss spectrum of HF between 7 and 46 eV has been studied with forward, inelastic scattering of 2.5 keV electrons at resolutions up to 60 meV fwhm. The (1π−t, 4σ)A 1Π state of HF has been identified at 10.35 eV (vertical). An apparently prominent progression, observed in optical studies and assigned to the (3σ−1, 4σ)B 1Σ+ state, was not detected in this work. A reasonably complete assignment of the Rydberg structure of HF is proposed.