Nuclear Reorientation Spectrum of Li7 in the Gaseous Monomers and Dimers of the Lithium Halides

The nuclear reorientation spectrum of Li7 has been observed in all of the lithium halides under conditions in which the degree of dimerization of the molecules is first low and then high. In each of the halides the two spectra have a qualitatively different appearance which can only be interpreted under the assumption that at least two different molecular species occur in the beam. An approximate resolution of the spectra into that of the monomer and that of the dimer may be made. Significant differences in both the internal magnetic and the electric quadrupole interactions occur for the monomer and the dimer.