Nouvelle cuve chauffante et evacuable pour l'infra-rouge

The details of the construction of a cell for the measurement, in the gase phase, of IR absorption spectra of crystalline substances is described. The cell can be evacuated to 10⁻⁵ mm Hg, heated to 250°C, and is equipped with interchangeable windows; its volume is approximately 100 ml and the optical path is 10 cm. The measurable quantity of substance is on the order of a few tens of milligrams and the substance is quantitatively recovered in a pure state after the measurement. Some problems posed by the functioning and the maintenance of the cell, as well as the advantages of the method, are discussed.