Infra-red spectra of CO adsorbed on NaCl, NaBr and NaI films were recorded at -196°C and for different surface coverages. The high surface area films were prepared by a method described previous1y.l The absorption bands were shifted, with respect to the gas phase, towards higher energies. For NaCl as adsorbent, the heat of adsorption was calculated for various adsorption sites and orientations of the adsorbate, and was found in agreement with experiment for molecules adsorbed perpendicularly on the surface Naf ions. A high contribution from the quadrupole field-gradient interaction was found. Spectral shifts were calculated, using the perturbation method. The perturbing potential was taken as a sum of four attractive and repulsion potentials. Good agreement with the experimental value of Av was found.
The electrostatic potential outside ionic crystals has been derived for the (110) planes of f.c.c. and b.c.c. lattices. By means of Fourier analysis, and applying the procedure of Lennard-Jones and Dent,' general expressions for these electrostatic potentials and their derivatives were obtained as functions of coordinates x , y and z.
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