Something as simple as the number of people in the laboratory or whether a window is open or closed, can lead to changes in background spectral absorbances from one scan to the next.
The supply of CO2 free air to the air bearing interferometer chamber ensures that the levels of carbon dioxide and water are maintained at constant, low levels thereby eliminating changes in spectral absorbances. Purging of the spectrometer body with CO2 free air also retard the degradation of the beam splitter through attack by moisture. The result is increased accuracy of analysis and improved instrument reliability.
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