A vacuum tight furnace has been constructed and used for laser–Raman spectroscopic studies of molten salts to 800°C. The sample container is positioned within the furnace by a removable metal block, several designs of which have been used with different types of sample containers. The sample under investigation is easily and rapidly aligned in the laser beam by means of micrometer screws located on the positioning table which supports the furnace. The compactness of the entire unit allows it to be readily moved into and out of the sample chamber of the spectrometer.

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