Infrared matrix spectra of lithium fluoride

Abstract

Evidence for a linear dimer Li2F2 has been obtained by extending the spectral measurements for matrix isolated lithium fluoride into the far infrared region. The vapors from solid 6LiF, 7LiF, and 6LiF/7LiF mixtures were deposited in argon matrices at liquid hydrogen temperatures. Vibrational assignments were made on the basis of the following linear species: 6Li2F2, 7Li2F2, 6,7Li2F2 and 7,6Li2F2. Although the specific geometry of the dimer could not be determined, a normal coordinate analysis supported the spectral interpretation of a linear structure (C8v).