INFRARED SPECTRA OF SODIUM SALTS IN CsCl DISKS.

The use of CsCl as a matrix for the preparation of disks for infrared spectra of sodium salts was investigated. During the grinding of the disks, sodium salts from a substitutional solid solution of hydrated Na** plus in a CsCl lattice. The IR spectrum of the substitutional hydrated solid solution has four characteristic HOH absorption bands which are very sharp, whereas in general, the spectra of hygroscopic salts have broad HOH absorption bands. The spectra of sodium salts in a CsCl matrix were compared to those of (1) potassium halides and LiCl in KBr, CsCl, and Csl matrices; (2) various cesium salts in NaCl and NaBr matrices; (3) various sodium salts in a CsI matrix.