Paramagnetic Term of the Susceptibility and Its Shift with Isotope in LiF

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Abstract
The rotational magnetic moments μJ/ J have been measured for Li6F and Li7F in the same magnetic field. These measurements, when combined with the experimental value of μe2A for Li6F, yield a value for the internuclear distance which disagrees with the value obtained from vibrational spectra. It is proposed that the discrepancy is due to an error in assuming that the high-frequency or paramagnetic term χHF in the magnetic susceptibility is the same for each isotopic species. If the internuclear distances calculated from infrared spectra are assumed to be correct the high-frequency term is found to be χHF=(1.25±0.02)×10−5 erg G−2 mole−1.The isotopic shift ΔχHF is calculated separately and found to be ΔχHF=(5.0±0.5)×10−8 erg G−2 mole−1.This represents a decrease of 0.4% from Li6F to Li7F. A calculation of the electric dipole moment of Li6F from the same data yields, μe=6.40±0.04 D (v=0).