Abstract

<p>Experimental details for the taking of infrared absorption spectra of thin solid layers at various temperatures are given and a method described for measurement of their thickness. An account of the preparation of suitable samples for reflection spectra is also included.</p><p>The spectra of the four ammonium halides at 20°C and -150°C have been obtained and the results interpreted in terms of their crystal structure. The data support the following symmetries for the ammonium ion in the low temperature form: (I) T<sub><i>d</i></sub> in ammonium chloride, (II) V<sub><i>d</i></sub> in ammonium bromide, (III) V<sub><i>d</i></sub> in ammonium iodide, and (IV) C<sub>3<i>v</i></sub> or C<sub>3</sub> in ammonium fluoride.</p>

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