Design and performance are given of a multiple traversal low temperature absorption cell that operates routinely at a path length of 230 m. The system is comprised of an ƒ/30-aperture White cell surrounded by an aluminum Dewar. The cell has been used in the temperature range 300-77 K and may be pressurized to 3 atm. Vacuum feedthrough adjustments are employed in order to correct for defocusing of the mirrors during the cooling process.
Roger P. Blickensderfer, George E. Ewing, and Rex Leonard, "A Long Path, Low Temperature Cell," Appl. Opt. 7, 2214-2217 (1968)