Abstract
A small-volume long-path absorption cell has been designed for use with condensable samples. The absorption cell is temperature controlled and operates over the temperature range of −10 to 80 °C. To prevent condensation of the sample on the mirror surfaces, the mirrors are individually temperature controlled and maintained a few degrees above the ambient temperature of the absorption cell. The cell has been tested and used to measure weak absorptions in water vapor in the near infrared.
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