Data from the microwave spectra of all alkali halides excepting LiF, NaF, KF, RbF, and LiCl are given and analyzed in terms of molecular and nuclear constants. These yield internuclear distances and ionic radii for the gaseous alkali halides, molecular dipole moments, potential constants including four constants for some molecules, amount of covalent character from quadrupole coupling constants and from rotational effects, and mass ratios for isotopes of Li, K, Rb, Cl, and Br.

• Received 2 June 1954

DOI:https://doi.org/10.1103/PhysRev.96.629