Temperature and time changes of infrared spectra may be used for studies of kinetic processes. Since the measurements often require low temperatures within a wide temperature interval and the compounds used are subjected to rapid cooling, special infrared cells must be used in these cases. The requirements for such cells are to a certain extent satisfied by an infrared cell which may be used without entrance and exit optical windows and where a stream of cooling nitrogen vapor prevents atmospheric water vapor from condensing on the cooled cell. The simple design of this cell makes possible a rapid cooling of the sample either by immersing it into liquid nitrogen or by spraying the sample on a precooled disc. Such a cell was used for the measurement of the activation energy of the conformational transition in chlorocyclohexane. However, the cell cannot be used below — 150°C because below this temperature condensation of carbon dioxide on the sample pellets of the cell takes place.
J. Štokr, Z. Růžička, and S. R. Ekwal, "A Variable Temperature Cell for the Measurement of Infrared Spectra," Appl. Spectrosc. 28, 479-481 (1974)
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