Abstract
Raman spectra of the torsional and lattice modes in single crystals of the chloride, bromide and iodide salts of the ethylammonium ion, C2H5NH, have been obtained over the range between liquid nitrogen and room temperatures. Corresponding infrared spectra of the torsional modes of the salts in caesium halide discs have also been obtained at the two temperature extremes. In general the modes all show an apparently linear decrease in frequency with increasing temperature. The torsions show relatively large splittings between their Raman and infrared components, due to interactions between adjacent rotors in the lattice. A two-rotor model has been applied to attempt to quantify the principal threefold barriers to rotation and the interaction potential constants for both the NH and CH3 rotors. The torsional frequencies and barriers reflect the changing effects from one salt to another, of hydrogen bonding and steric forces in the lattice.
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