Abstract
The magnetic resonance absorption spectrum of the diatomic fluorine molecule‐ion, F2, in single crystals of lithium fluoride, sodium fluoride, and potassium fluoride is reinvestigated. For each of these structures it is found that the spectrum of this molecule‐ion species exhibits the D2h, symmetry of its environment. Comparisons between observed and predicted spectral line field positions and spectral parameters derived from data taken at T = 4.2 K are given.