The Journal of Chemical Physics · 1967 · 51 citations · 10 references
Natural SciencesChemistryMaterials ScienceAnalytical ChemistryInorganic ChemistrySpectroscopyInfrared SpectroscopyMolecular SymmetryOptical SpectroscopySpectral InterpretationVibrational SpectroscopyInfrared Absorption SpectraInfrared Absorption SpectroscopyInfrared SpectraInfrared Spectral AssignmentIsolationMatrix Isolation SpectroscopyMatrix Isolation StudiesOptical Isotope Shifts
The infrared spectrum of the vapor species above lithium fluoride has been examined in the frequency range 4000–200 cm−1 using the matrix isolation technique. The spectrum is interpreted in terms of monomer, dimer, and trimer molecules. Isotope shifts are consistent with a planar cyclic configuration for the dimer. The 7Li dimer has the following infrared-active fundamentals: v(B3u)=655 cm−1, v(B2u)=570 cm−1, and v(B1u)=300 cm−1. The remaining infrared-inactive frequencies of the dimer are estimated at v(Ag)=560 cm−1, v(Ag′)=280 cm−1, and v(B1g)=490 cm−1. The following frequencies are tentatively assigned to the infrared active fundamentals of the 7Li trimer, 230, 267, 509, and 736 cm−1.
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