Ram pressure forces outside air through the 1 inch diameter inlet tube
(center of picture) and then through a Teflon bellows to the AFTIR White cell,
where we measure it's infrared spectrum every 0.8 seconds. Metallic parts of
the AFTIR system, including the inlet, are coated with halocarbon wax to minimize
wall interactions with reactive compounds. In addition, the residence time in the
exterior portion of the inlet is only ~2.5 milliseconds.