Carbon Dioxide (CO2) Reference Cell.
These flame-sealed cells contain 100 Torr of >99.9% pure carbon dioxide (CO2) at room temperature. They are used for calibration of tunable lasers around 3500-3750 cm-1 (2665-2855 nm).
The quartz cell body is cylindrical in shape; outer diameter 10 mm; length 50 mm. The tipoff stem is centered on the cell, protruding not more than 8 mm from the cell body. Windows are angled 11° off of normal and have a 2° interior wedge to prevent back-reflection and etalon effects.